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Variation of nutrient fluxes by rainfall redistribution processes in the forest canopy of an urban larch plantation in northeast China

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Journal of forestry Research 2022年第4期33卷 1259-1269页

作者： Houcai Sheng Na Guo Cunyong Ju Tijiu Cai Center for Ecological Research Northeast Forestry UniversityHarbin 150040People’s Republic of China Key Laboratory of Sustainable forest Ecosystem Management-Ministry of Education Northeast Forestry UniversityHarbin 150040People’s Republic of China College of Food Engineering East University of HeilongjiangHarbin 150040People’s Republic of China

Atmospheric deposition(dry and wet deposition)is one of the primary sources of chemical inputs to terrestrial ecosystems and replenishes the nutrient pool in forest *** often acts as a primary transporting agent and solvent;thus,nutrient cycles in forests are closely linked to hydrological *** collected precipitation data during a growing season to explore variations in nutrient cycling and nutrient balances in the rainfall redistribution process(wet deposition)in a larch plantation in northeast *** measured nutrient(NO_(3)^(-),PO_(4)^(3−),Cl^(−),K,Ca,Na,and Mg)inputs via bulk precipitation,throughfall and stemfl ow,and used a canopy budget model to estimate nutrient fl uxes via canopy *** results suggest that the average concentrations of the base cation(K,Ca,Na,and Mg)showed the following order:stemfl ow>throughfall>bulk *** and stemfl ow chemistry dramatically fl uctuated over the growing season when net fl uxes(throughfall+stemfl ow—bulk precipitation)of NO−3,PO3−4,SO2−4,Cl−,K,Ca,Na,and Mg were−6.676 kg·ha^(-1),−1.094 kg·ha^(-1),−2.371 kg·ha^(-1),1.975 kg·ha^(-1),0.470 kg·ha^(-1),−5.202 kg·ha^(-1),−0.336 kg·ha^(-1),and 1.397 kg·ha^(-1),*** results suggest that NO−3,PO3−4,SO2−4,Ca,and Na were retained,while Cl−,K,and Mg were washed off by throughfall and stemfl ow.

关键词： Rainfall redistribution Aqueous fluxes Water chemistry Macronutrients input plantation forest Harbin

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Effects of natural forest conversion and plantation tree species composition on soil macrofauna communities in Northeast China mountains

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林业研究:英文版 2023年第5期34卷 1475-1489页

作者： Shuangjiao Ma Qingcheng Wang Yong Zhang Limei Yan Donghai Cui Liqing Xu Key Laboratory for Sustainable forest Ecosystem Management−Ministry of Education School of ForestryNortheast Forestry UniversityHarbin 150040People’s Republic of China

As primary and secondary forests are being replaced by plantations across the globe,the soil macrofauna community structure is also affected,but little is known about the impact of mixed culture plantations compared with monocultures on the soil *** determine the impact of forest conversion on soil macrofauna,we surveyed the soil macrofauna in two broad-leaved and three coniferous monoculture stands and four coniferous-broadleaved mixed stands,and in adjacent reserved secondary stands as a *** macro fauna community composition was significant affected by forest type,season and their interaction(Pplantation *** monoculture stands and secondary stands had similar macrofauna abundance and taxa richness,but values were lower in coniferous stands than in secondary *** Shannon index for macrofauna in coniferous stands was also the lowest,but the Pielou index did not differ between forest *** negative effects of the conifer monoculture on soil macro fauna were not present in the mixed stands with broad-leaved *** conversion impacted soil properties;soil moisture,NO_(3)^(-),and pH were significant drivers of soil macrofauna community *** impact of forest conversion on soil macrofauna was closely dependent on tree species composition and *** macro fauna community structure in the broadleaved and the mixed stands were relatively similar to that in the natural forest,and thus recommended for forest conversion in the study area.

关键词： forest conversion plantation forest Tree species composition Soil macrofauna Diversity Functional group

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Why Pinus sylvestris *** plantation forests in southeastern Keerqin sandy land of China decline?

Why Pinus sylvestris *** plantation forests in southeastern ...

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第三世界生态高峰会

作者： ZhuJ.J.~1 KangH.Z.~(1,2) Wu X.Y.~3 Xu M.L.~(1,2*) ~1Institute of Applied Ecology,Chinese Academy of Sciences.Shenyang 110016,P.R.China ~2Graduate School,Chinese Academy of Sciences.Beijing 100039,P.R.China ~3University of Engineering & Technology.Liaoning,Fuxin 123000.P.R.China ~3Office of inspection & quarantine for leaving and entering houndary,Shandong.Linyi 276000.P.R.China

Pinus sylvestris ***(PSM)is a geographical variation of Scots pine(***).PSM forests on sandy land naturally distributes in Honghuaerji,Hulunbeier sandy plain of China(N47°35′ -48°36′E118°58′-120°32′).The first introduction of PSM to the southeastern Keerqin sandy land,northern China(N42°43.508′ E122°32.89′)was carried out in the beginning of *** about 40 years since the introduction,decline phenomena occulted in the PSM plantation forests(1989).Comparing with the natural PSM forests on sandy land,we found that the PSM plantation forests in Keerqin sandy land had the following features:1)the shorter lifetime than natural forests;2)the declined appearance characterized by low growth rate,top,twig and needle withered,and tree death;and 3)no natural *** reasons why the differences existed between the natural and plantation forests on sandy land were analyzed from ecological views based on long-term observations and the results of a series of experiments including the analysis on ecological conditions, effects of water stresses,photosynthesis observation and collection of eetomycorrhizal fungi etc..The results indicated that PSM trees in plantation forests grew faster tban those in natural forests in the early period of introduction because of higher heat and rainfall with almost the same soil nutrient in the plantation *** the declined appearance did not occur at the plantation sites,the lifetime of plantation forests was only about half of the natural ***, the conditions such as water,temperature and silvicultural measures in the plantation sites did not fit the furtber growth and development of the plantation trees after a certain years since the introduction, especially for the large-area pure PSM plantation forests;then the tree growth slowed down,and the vigor decreased,top,twig and needle withered,diseases and insects occurred *** results led to the appearance of evident decline characteristics

关键词： Decline Pinus sylvestris var mongolica plantation forest sandy land regeneration

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Effects of afforestation on soil carbon turnover in China＇s subtropical region

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Journal of Geographical Sciences 2011年第1期21卷 118-134页

作者： WANG Shaoqiang LIU Jiyuan ZHANG Cheng YI Chuixiang WU Weixing Key Lab of Ecosystem Network and Modelling Institute of Geographic Sciences and Natural Resources Research CAS Beijing 100101 China Queens College City University of New York New York USA

Afforestation in China＇s subtropics plays an important role in sequestering CO2 from the atmosphere and in storage of soil carbon （C）. Compared with natural forests,plantation forests have lower soil organic carbon （SOC） content and great potential to store more C. To better evaluate the effects of afforestation on soil C turnover,we investigated SOC and its stable C isotope （δ13C） composition in three planted forests at Qianyanzhou Ecological Experimental Station in southern China. Litter and soil samples were collected and analyzed for total organic C,δ13C and total nitrogen. Similarly to the vertical distribution of SOC in natural forests,SOC concentrations decrease exponentially with depth. The land cover type （grassland） before plantation had a significant influence on the vertical distribution of SOC. The SOC ？13C composition of the upper soil layer of two plantation forests has been mainly affected by the grass biomass 13C composition. Soil profiles with a change in photosynthetic pathway had a more complex 13C isotope composition distribution. During the 20 years after plantation establishment,the soil organic matter sources influenced both the δ13C distribution with depth,and C replacement. The upper soil layer SOC turnover in masson pine （a mean 34% of replacement in the 10 cm after 20 years） was more than twice as fast as that of slash pine （16% of replacement） under subtropical conditions. The results demonstrate that masson pine and slash pine plantations cannot rapidly sequester SOC into long-term storage pools in subtropical China.

关键词： soil organic carbon stable carbon isotope plantation forest

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Organic matter accumulation in hill forests of Chittagong region,Bangladesh

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Journal of forestry Research 2009年第3期20卷 249-253,287页

作者： S.M.Sirajul Haque Nirmal Chandra Karmakar Institute of forestry and Environmental Sciences University of Chittagong

Litter fall and its effect on forest soil properties at each decomposition stages were investigated in tropical monsoon climatic conditions of three plantations (7-year acacia plantation, 15-year acacia plantation and 18-year mixed plantation) and one natural forest (Sitapahar forest) from Chittagong hilly region of Bangladesh. Results showed that total accumulation of organic matter increased with plantation age, accompanying with a decrease of annual accumulation rate. Within the same vegetation type, the organic accumulation of both fresh and partially decomposed litter with humus varied significantly (p≤0.05) on hill positions, being highest on bottom slope and decreased gradually towards hilltop in the forest. Reverse trend in accumulation of soil organic matters was shown in 15-year Acacia auriculiformis plantation, from where fuel wood collected. In 7-and 15-year acacia and 18-year mixed broadleaved plantations, rates of total organic matter production consisting of fresh, partially and completely decomposed litter as well as incorporated organic matter in soil were 2554.31, 705.79 and 1028.01 kg·ha-1·a-1, respectively, and the corresponding contribution from fresh litter were 38.23, 19.40 and 30.48 kg·ha-1·a-1, respectively. In the three plantations and the natural forest, on an average fresh litter constituted 32.45%, partially decomposed litter with humus 13.50% and incorporated organic matter in soil 54.56% of the total organic matter production with mean litter thickness of 0.90 cm. Soil acidity increased with the increase of decomposition stage of organic matter.

关键词： accumulation rate decomposition stages hill forest organic matter plantation forest

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Impact of site management on changes in soil carbon after afforestation:A review

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forestry Studies in China 2010年第3期12卷 158-165页

作者： SHI Jun CUI Lin-li TIAN Zhan Shanghai Climate Center Shanghai 200030 P. R. China Shanghai Center for Satellite Remote Sensing and Application Shanghai 201100 P. R. China

Afforestation and forest management can increase carbon stocks and account for emission reduction according to the Kyoto Protocol. Site management has important effects on the accumulation of soil carbon after afforestation. This review examines the effects of site management, including soil disturbance, fertilization, thinning, weed control, harvesting and controlled burning, on soil carbon dynamics in plantations, based on recent published results. Soil disturbance can enhance soil carbon losses, with whole ploughing causing the most and disking the least loss of soil carbon. The effects of fertilization and thinning on soil carbon are in- conclusive. Weed control can prevent the carbon input from above-grotmd residue and root turnover and increase soil temperature and soil erosion, which in turn reduces the amount of carbon on the soil surface. Soil carbon decreases with the increase of harvest- ing intensity and the retention of harvest residue can significantly enhance the accumulation of carbon in the soil. Controlled burning before afforestation has a short-term benefit for soil carbon, but it is not beneficial to the sequestration of soil carbon over the long term. Future studies should focus on investigating the long-term impact of site management practices, especially soil fertilization and thinning, on carbon, identifying the response of major functional pools of soil carbon to management practices, understanding the dy- namics of soil nitrogen pools and their role in long-term soil carbon sequestration, as well as quantifying soil carbon processes under different climate conditions and site management scenarios using models.

关键词： site management soil carbon afforestation plantation forest

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Effect of Slope on Growth of Three Hard Broadleaved TreeSpecies in Northeast China

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Journal of forestry Research 1998年第1期9卷 27-30页

作者：任青山柴一新王景升

Analysis on tree hegiht and diameter(DBH) growth of the belt-mixed plantations of Fraxinus mandshurica,Phellodendron amurense and Juglans mandshurica(panted in 1986) were conducted by using the methods of variance analysis and multiple comparison. The results show that the position of slope is a significant physical factor to affect height growth and DBH growth. Fraxinus mandshurica grew best at meddle hill. Juglans mandshurica grew best at mid-down slope, and Phellodendron amurense grew best at down slope. The analysis of the positive edge effect was also made for belt-mixed plantation of Juglans mandshurica and Larix dahurica. The result indicated that Larix dahurica presented positive edge effect to growth of Juglans mandshurica present.

关键词： Slope position Faxinus mandshurica Juglans mandshurica Phellodendron amurense plantation forest

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Crystallity Change of Compressed Poplar Wood Treated by PF Resin

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Chinese forestry Science and Technology 2006年第1期5卷 8-13页

作者： ZHOU Haibin LIU Junliang JIANG Zehui Research Institute of Wood Industry Chinese Academy of forestry Beijing 100091. P.R. China

This study investigated the effect of weight percent gain （WPG） and compression set on the crystallity of compressed poplar wood. Tests were conducted to determine the mechanism of compressed wood set. The samples of 1-72 Poplar were treated with a PF resin of water-solubility and low molecular weight. Then the air-dried samples were hot-pressed to a certain thickness. Finally the specimens were obtained from the compressed samples and scanned with an X-ray diffractometer. Results show that before press the crystallity of the inner layer is lower than that of the outer layer, and at press the difference of the crystallity between the outer layer and the inner layer will slowly disappear and finally the crystallity of the inner layer exceeds that of the outer layer; with the increasing compression set the crystallity decreases, and there is a big decrease; the crystallity difference between two layers happens because of compression set gradient, WPG difference or the joint effect.

关键词： crystallity PF resin plantation forest X-ray diffractometer WPG compression set permanent set Poplar (Poplar euramaricana cv. 1-72)

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