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Long-term impacts of land-use change on dynamics of tropical soil carbon and nitrogen pools

Journal of Environmental Sciences 2004年第2期16卷 256-261页

作者： YANGJing-cheng HUANGJian-hui PANQing-min TANGJian-wei HANXing-guo LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing100093China. XishuangbannaTropicalBotanicalGarden ChineseAcademyofSciencesMengla666303China

land-use changes, especially the conversion of native forest vegetation to cropland and plantations in tropical region, can alter soil C and N pools and N availability for plant uptake. Deforestation, followed by shifting cultivation and establishment of rubber tree plantation, is a common land-use change in Xishuangbanna, southwest China. However the influence of this kind of land-use change on soil C and N dynamics in this region remains poorly understood. This study was conducted to assess the effects of land-use change on soil C and N pools. Soil samples were collected on five adjacent plots, which belong to three land-use types including secondary forest-an acuminate banana(Musa itinerans) secondary forest and a male bamboo(Dendrocalamus membranaceae) secondary forest, shifting cultivation, and rubber tree (Hevea brasiliensis (H.B.K.) Muell. Arg.) plantation(one plot is 3-year-old, and another is 7-year-old). We measured soil bulk density (BD), pH value, moisture content and concentrations of soil organic carbon(SOC), total soil nitrogen(TSN), and inorganic N(NO - 3-N and NH + 4-N ) at 0—3, 3—20, 20—40 and 40—60 cm depths, and calculated C and N pools in 0—20, 20—40, 40—60, and 0—60 cm soil layers. Compared with the adjacent secondary forests, shifting cultivation and establishment of rubber tree plantations resulted in significant decline in concentrations and stocks of SOC and TSN in 0—20 and 0—60 cm soil layers, and increase in pH and bulk density at 0—3, 3—20, and 20—40 cm depths. Soil moisture content decreased only in 0—20 cm surface soils in shifting cultivation and plantations. The dynamics of mineral N was much more complex, which had different trends among depths and ecosystems. Compared with the secondary forests, SOC stocks in 0—20 cm surface soils in shifting cultivation and rubber tree plantations(3-year-old plantation and 7-year-old plantation) decreased by 34.0%, 33%, and 23%; and TSN stocks decreased by 32 2%, 20.4%, and 20.4%, respectively, whereas the decreases of SOC and TSN stoc

关键词： soil organic carbon(SOC) total soil nitrogen(TSN) inorganic nitrogen land-use change tropical soil Xishuangbana

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The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

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Ecological Processes 2021年第1期10卷 528-548页

作者： Yasuaki Tanaka Elizerberth Minggat Wardina Roseli Environmental and Life Sciences Faculty of ScienceUniversiti Brunei DarussalamJalan Tungku LinkGadong BE1410Brunei Darussalam

Tropical primary forests have been disappearing quickly to make use of the land for commercial purposes.land-use change has an impact on downstream aquatic processes,but those impacts have mainly been studied in temperate climate regions.The present article reviews the impacts of various tropical land-use changes caused by human activities on downstream riverine and estuarine water properties and biogeochemical cycles,focusing especially on the behaviors of nitrogen(N)and phosphorus(P).Logging of tropical primary forests,subsequent establishment of pasture lands,and occasional wildfire or intentional burning have decreased terrestrial N fixation and increased the discharge of P combined with soils,which has lowered the N:P ratio of dissolved inorganic nutrients in the adjacent stream waters and downstream rivers.Agricultural fertilizers and aquacultural practices basically cause nutrient enrichment in downstream riverine and estuarine waters,changing the N:P ratio depending on the source.Finally,urbanization causes eutrophication in many tropical estuaries,where a halocline forms easily because of a warm temperature throughout the year and the water at the bottom of the estuary tends to become hypoxic or anoxic.Overall,the impact of land-use change on aquatic processes may be more serious in tropical regions than in temperate or cold climate regions because of(1)a higher biomass and nutrient stock in original tropical forests;(2)higher precipitation,more frequent episodic flooding,and warmer temperatures in tropical regions;and(3)certain practices that are rapidly expanding in tropical regions such as land-based aquaculture.Various land-use changes are causing downstream nutrient enrichment or disturbance of the nutrient balance at tropical land-sea interfaces,and the overall N:P ratios in the aquatic ecosystem seem to be declining.Nonetheless,if proper management is conducted and the discharge of nutrients and soils ceases,tropical aquatic systems may have the potential to recover faster than those in other clim

关键词： Deforestation land-use change Eutrophication Water quality Hypoxia Environmental monitoring Aquatic conservation Water resources

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land use change characteristics affected by water saving practices in Manas River Basin,China using landsat satellite images

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International Journal of Agricultural and Biological Engineering 2017年第6期10卷 123-133页

作者： Yang Guang Chen Dong He Xinlin Long Aihua Yang Mingjie Li Xiaolong College of Water Conservancy and Architectural Engineering Shihezi UniversityShihezi 832000China Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production and Construction Corps Shihezi 832000China China Water Resources&Hydropower Science Research Institute Beijing 100038China

The characteristics and influencing factors of land use change under arid conditions were studied in the Manas River Basin in Xinjiang Region,Northwest China.landsat satellite images acquired in 1976,1990,2000,2010 and 2015 over the study area were used as basic data.land use change,the rate of change of land use,land use transfer and other aspects revealed the characteristics of land use change and related factors as influenced by water conditions in the basin.The results showed that:(1)Over nearly 50 years,land reclamation in the Manas River Basin resulted in the rapid expansion of an artificial oasis area,and promoted the process of‘oasis urbanization’,and accelerated the development of the river basin economy.(2)In 2000,the popularization of drip irrigation under mulch technology led to the rapid growth of cultivated land and development land in the watershed.Meanwhile,the water table declined in the desert area of the lower reaches of the river basin,and the area occupied by sparse shrub forest and grassland decreased.(3)Before popularization of water-saving technology,woodland,grassland and development land transformed to cultivated land in the amounts of 93.46 km^(2),2542.93 km^(2) and 137.53 km^(2),respectively,and woodland transformed in the amount of 189.64 km^(2).After water-saving technology was popularized,woodland,grassland and development land were transformed into cultivated land in the amounts of 567.41 km^(2),1756.2 km^(2) and 37.36 km^(2),respectively.(4)The popularization of water-saving technology made the dynamic degree of cultivated land and development land more active,and further increased landscape fragmentation and landscape heterogeneity.The level of urbanization development,the level of economic development and the dry humidity of the basin became the main factors affecting the change of land use in the basin.

关键词： land-use change spatial characteristics influencing factor Manas River Basin landsat satellite images

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Using classification assignment rules to assess land-use change impacts on forest biodiversity at local-to-national scales

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Forest Ecosystems 2018年第2期5卷 162-176页

作者： Kathrin Affeld Susan K. Wiser Ian J. Payton Miquel DeCaceres Manaaki Whenua - landcare Research PO Box 69040 Lincoln 7640 New Zealand Lincoln University PO Box 85084 Lincoln 7647 New Zealand Forest Science Centre of Catalonia Ctra. Sant Llorenc km.2 E-25280 Solsona Spain

Background： Ecosystem representation is one key component in assessing the biodiversity impacts of land-use changes that will irrevocably alter natural ecosystems. We show how detailed vegetation plot data can be used to assess the potential impact of inundation by a proposed hydroelectricity dam in the Mokihinui gorge, New Zealand, on representation of natural forests. Specifically we ask： 1） How well are the types of forest represented Locally, regionally, and nationally; and 2） How does the number of distinct communities （i.e. beta diversity） in the target catchment compare with other catchments nationally？ Methods： For local and regional comparisons plant species composition was recorded on 45 objectively located 400 m2 vegetation plots established in each of three gorges, with one being the proposed inundation area of the Mokihinui lower gorge. The fuzzy classification framework of noise clustering was used to assign these plots to a specific alliance and association of a pre-existing national-scale classification. NationaLly, we examined the relationship between the number of alliances and associations in a catchment and either catchment size or the number of plots per catchment by fitting Generalised Additive Models. Results： The four alliances and five associations that were observed in the Mokihinui lower gorge arepresent in the region but limited locally. One association was narrowly distributed nationally, but is the mostfrequent association in the Mokihinui lower gorge; inundation may have consequences of national importance to its long-term persistence. That the Mokihinui lower gorge area had nearly twice as many plots that could not be assigned to pre- existing alliances and associations than either the Mokihinui upper or the Karamea lower gorges and proportionally more than the national dataset emphasises the compositional distinctiveness of this gorge. These outlier plots in the Mokihinui lower gorge may be unsorted assemblages of species or reflect sampling bias or that native- dominated woody ri

关键词： Beta-diversity Biodiversity conservation Environmental impacts Ecosystem representation Hydroelectricity dams land-use change National vegetation classification Noise clustering New Zealand NVS databank Plant community composition

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Separating the impacts of climate variability,land-use change and large reservoir operations on streamflow in the Yangtze River basin,China,using a hydrological modeling approach

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International Journal of Digital Earth 2021年第2期14卷 231-249页

作者： Ning Nie Wanchang Zhang Min Liu Hao Chen Dengzhong Zhao Key Laboratory of Geographic Information Science of the Ministry of Education School of Geographic SciencesEast China Normal UniversityShanghaiPeople’s Republic of China Aerospace Information Research Institute Chinese Academy of SciencesBeijingPeople’s Republic of China Institute of Eco-Chongming(IEC) ShanghaiPeople’s Republic of China Institute of Surface-Earth System Science School of Earth System ScienceTianjin UniversityTianjinPeople’s Republic of China Tianjin Key Laboratory of Earth Critical Zone Science and Sustainable Development in Bohai Rim Tianjin UniversityTianjinPeople’s Republic of China Changjiang River Scientific Research Institute WuhanPeople’s Republic of China

Separating the individual effects of climate variability and human activities on streamflow is more important than just knowing their combined effects.In this paper,using a scenario-based hydrological simulation approach,the streamflow changes caused by climate variability and two different types of human activities(i.***.land-use change and large reservoirs operations)as well as the contribution rates of these three factors over 272 sub-basins in the Yangtze river basin were quantified and compared among 5 different periods(i.e.1988–1992(P1),1993–1997(P2),1998–2002(P3),2003–2007(P4)and 2008–2012(P5)).Results demonstrate that,at the annual scale,climate variability played a leading role in the change in outflow of most sub-basins.With regard to the seasonal variations in discharge at Datong station,climate factors played a predominant role during P1-P2 and P2-P3.Since the Three Gorges Reservoir began operating in 2003,the discharge was enhanced by reservoirs in January-May and reduced by reservoirs in JulyDecember.Reservoir and climate factors codetermined seasonal streamflow change during P3-P4 and P4-P5.land-use change made the smallest contribution to seasonal discharge fluctuations.This study can support decision-making in regional water resources planning and management.

关键词： Climate variability land-use change reservoirs streamflow Yangtze River Basin

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land use change and soil erosion in the Maotiao River watershed of Guizhou Province

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Journal of Geographical Sciences 2011年第6期21卷 1138-1152页

作者： XU Yueqing LUO Ding PENG Jian Department of land Resources and Management College of Resources and Environmental SciencesChina Agricultural University Beijing 100193 China Chongqing Geomatics Center Chongqing 401121 China School of Management Central University for Nationality Beijing 100081 China

Due to the extremely poor soil cover, a low soil-forming rate, and inappropriate intensive land use, soil erosion is a serious problem in Guizhou Province, which is located in the centre of the karst areas of Southwest China. In order to bring soil erosion under control and restore environment, the Chinese Government has initiated a serious of ecological re- habilitation projects such as the Grain-for-Green Programme and Natural Forest Protection Program and brought about tremendous influences on land-use change and soil erosion in Guizhou Province. This paper explored the relationship between land use and soil erosion in the Maotiao River watershed, a typical agricultural area with severe soil erosion in central Guizhou Province. In this study, we analyzed the spatio-temporal dynamic change of land-use type in Maotiao River watershed from 1973 to 2007 using landsat MSS image in 1973, landsat TM data in 1990 and 2007. Soil erosion change characteristics from 1973 to 2007, and soil loss among different land-use types were examined by integrating the Revised Universal Soil Loss Equation （RUSLE） with a GIS environment. The results indicate that changes in land use within the watershed have significantly affected soil erosion. From 1973 to 1990, dry farmland and rocky desertified land significantly increased. In contrast, shrubby land, other forestland and grassland significantly decreased, which caused accelerated soil erosion in the study area. This trend was reversed from 1990 to 2007 with an increased area of land-use types for ecological use owing to the implementation of environmental protection programs. Soil erosion also significantly varied among land-use types. Erosion was most serious in dry farmland and the lightest in paddy field. Dry farmland with a gradient of 6°-25° was the major contributor to soil erosion, and conservation practices should be taken in these areas. The results of this study provide useful information for decision makers and planners to take sustainable land use management and soil co

关键词： land-use change land-use type soil erosion Revised Universal Soil Loss Equation Guizhou Provinceof China

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Effects of land use change on hydrological cycle from forest to upland field in a catchment,Japan

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Frontiers of Structural and Civil Engineering 2013年第4期7卷 456-465页

作者： Chuan ZHANG Keiji TAKASE Hiroki OUE Nobuhiro EBISU Haofang YAN The United Graduate School of Agricultural Sciences Ehime UniversityEhime Pref 790-8577Japan Faculty of Bioresources and Environmental Sciences Ishikawa PrefecturalIshikawa 920-8580Japan Faculty of Agriculture Ehime UniversityEhime Pref 790-8577Japan

Understanding the effects of land use change on the hydrological cycle is very important for development of sustainable water resource in an upland field catchment.In this study,soil and hydrological properties in an upland field catchment,which was reclaimed partially from a forest catchment,were compared with another forest catchment.The soil properties of surface and subsurface layers were investigated in the two catchments.The soil was compacted and waterholding capacity of soil in the upland field catchment became smaller after the reclamation from forest to upland field,which decreased infiltration rate and water storage in the soil layers.We found that peak discharge and direct runoff in the upland field catchment increased compared with the forest catchment.Annual evapotranspiration from the upland field catchment tended to be lower due to the change in vegetation type and soil properties.Furthermore,a semi-distributed hydrological model was applied in the upland field catchment to understand the integrated effects of reclamation on the hydrological cycle.The model parameters,which were determined using a nonlinear optimization technique—the Shuffled Complex Evolution method(SCE),were compared between the two catchments.The Nash and Sutcliffe coefficient was used to evaluate the model performance.The simulated results indicated that evapotranspiration was decreased and change in discharge was more obvious in the surface layer.We considered that declined infiltration and water storage and increased peak discharge and direct runoff have a negative impact on water resources in the upland field catchment.This study will provide information for forest managers in planning and making decisions for land and water resource management.

关键词： land-use change hydrological processes upland field catchment forest catchment semi-distributed hydrological model

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Effects of land-use and climate change on sediment and nutrient retention in Guizhou,China

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Ecosystem Health and Sustainability 2020年第1期6卷 185-197,184页

作者： Huiqing Han Jianqiang Yang Geng Ma Yue Liu Linan Zhang Siying Chen Shuliang Ma School of Architecture and Urban Planning Guizhou Institute of TechnologyGuiyangPR China School of Economics and Management Guizhou Institute of TechnologyGuiyangPR China

Introduction:Sediment and nutrient retention have significant impacts on agricultural productivity and water quality.Obvious changes of climate and land-use have deeply affected freshwater ecosystem services in the last several decades.Nevertheless,it is unclear what the differences are in the impact of climate and land-use changes on freshwater ecosystem services.Outcomes:The impacts of climate and land-use change on sediment and nutrient retention(two essential freshwater ecosystem services)were evaluated with the help of the Integrated Valuation of Environmental Services and Tradeoffs(InVEST)model.The results from the study area suggest a decreasing trend in sediment and nutrient retention from 1995 to 2015 when climate and land-use were changed simultaneously.A decreasing trend in sediment retention and an increasing trend in nutrient retention were presented under scenario A(climate change from 1995 to 2015 with land-use unchanged),while the sediment exported and nutrient retention exhibited a decreasing trend except sediment retained under scenario B(land-use change from 1995 to 2015 with unchanged climate).Rainfall erosivity and soil erodibility were more sensitive to the output of sediment retention,while retention efficiency produced more of an effect on nutrient retention.Discussion and Conclusion:Climate change played a dominant role in the change in sediment retention,while land-use change had a more significant effect on nutrient retention change than climate change.The results of this study provide explicitinformation for land-use managers to reduce the negative effects associated with sediment and nutrient retention.

关键词： Climate change land-use change InVEST model nutrient retention scenario analysis sediment retention

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A Methodology Framework for Regional land-use change Studies based on landsat TM images: A Case Study in Northeast China

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Chinese Journal of Population,Resources and Environment 2004年第4期2卷 3-11页

作者： Deng Xiangzheng , Huang Shumin , Zhan Jinyan & Zhao Tao Center for Chinese Agricultural Policy, Chinese Academy of Sciences, Beijing 100101 Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101 Anthropology Department, Iowa State University, Ames, Iowa 50010-1050, USA, Center for Chinese Agricultural Policy Chinese Academy of Sciences Beijing 100101 China Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 China Anthropology Department Iowa State University Ames IA 50010-1050 United States

land-use change is an important aspect of global environment change. It is, in a sense, the direct result of human activities influencing our physical environment. This paper analyzed the land-use change in Northeast China during 1985-2000 based on landsat TM images. It divides Northeast China into five land-use zones based on the dynamic degree model of land-use: woodland/grassland-arable land conversion zone, dry land-paddy field conversion zone; urban expansion zone, interlocked zone of farming and pasturing and reclamation and abandon zone. The findings include the obvious increase of cropland area, paddy field and dry land increased by 75 and 276 thousand hm2 respectively; urban areas expanded rapidly, areas of town and rural residence increased by 76.8 thousand hm2; areas of forests and grassland decreased sharply with the amounts of 1399 and 1521 thousand hm2 respectively; areas of water body and unused land increased by 148 and 514 thousand hm2 respectively. This paper also discusses the

关键词： spatial pattern land use land-use change driving force Northeast China

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STUDY ON THE SPATIAL PATTERNS OF land-use change AND ANALYSES OF DRIVING FORCES IN NORTHEASTERN CHINA DURING 1990-2000

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Chinese Geographical Science 2002年第4期 11-20页

作者： LIU Ji-yuan 1 ,DENG Xiang-zheng 1 ,LIU Ming-liang 1 ,ZHANG Shu-wen 2 (1.Institute of Geographical Sciences and Natural Resources Research,t he Chinese Academy of Sciences,Beijing 100101,P.R.China 2.Changchun Institute o f Geography,the Chinese Academy of Sciences,Changchun 130012,P.R.Chi na)

land-use change is an important aspect of global environment change.It i s,in a sense,the direct result of human activities influencing our physical environment.Supported by the dynamic serving system of nation al resources,including both the environment data base and GIS technology,this paper a nalyzed the land-use change in north eastern Chi-na in the past ten years(1990-2000).It divides northeastern China into five land-use zones based on the dynamic de-gree(DD)of land-use:woodland /grassland -a rable land conversion zone,dry land-paddy field conversion zone,ur-ban expansion zone,interlocked zon e of farming and pasturing,and recla mation and abandoned zone.In the past ten years,land-use change of northeastern China can be generalized as follo ws:increase of cropland area was obvious,pad-dy field and dry land increased by 74.9and 276.0thousand ha respectively;urban area expanded rapidly,area o f town and rural residence increased by 76.8thousand ha;area of forest and grassland decreased sharply with the amo unt of1399.0and 1521.3thousand ha respec tively;area of water body and unused land increased by 148.4and 513.9thou-sand ha respectively.Besides a comp rehensive analysis of the spatial patterns of land use,this paper also di scusses the driving forces in each land-use dynamic zones.The study shows that some k ey biophysical factors affect consp icuously the conversion of different land-use ty pes.In this paper,the relationship s between land-use conversion and DEM,accumulat-ed temperature(≥10℃)and precipitation were analysed and represented.We conclude that the la nd-use changes in north-east China resulted from the change o f macro social and economic factors a nd local physical elements.Rapid population growth and management changes,in so me sense,can explain the shaping of woodland /grassland -cropland conve rsion zone.The conversion from dry land to paddy field in the dry land -paddy fie ld conversion zone,apart from the ph ysical elements change promoting the expan sion of paddy field,results from two

关键词： land use land-use change spatial pattern driving force northeastern China CLC number:F301.24Document code:A Article ID-0063(2002)04-0299-10

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