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Distribution Characteristics of Soil Organic Matter and Total Nitrogen on the Yajiageng vertical belt,Gongga Mountain around the Dadu River Banks

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Wuhan University Journal of Natural Sciences 2008年第3期13卷 331-335页

作者： YAN Yan WANG Xiaodan Institute of Mountain Hazards and Environment ChineseAcademy of Sciences Chengdu 610041 Sichuan China

Distribution characteristics of soil organic matter（SOM） and total nitrogen（TN） were studied in different plant communities of the Yajiageng vertical belt in Gongga Mountain around the Dadu River banks. The results show：（1） the contents of SOM and TN of the plant communities gradually decreased with the following order： subalpine coniferous forest （3 027 m）, subalpine meadow （3 873 m）, coniferous broadleaved mixed forest（2 737 m）, subalpine shrub（3 565 m） and treeline（3 564 m）. （2） With soil profile depth increasing, the contents of SOM and TN gradually decreased. For different vegetation types, the contents of SOM and TN in sub-alpine coniferous forest were higher than that of other vegetational types. （3）The ratio of the content of carbon to the content of total nitrogen （Cc/CTN）WaS 13.5-27.6, which was relatively lower than the appropriate Cc/CTN of 25-30, and indicated that the soil in favor of the organic matter decomposed and nutrients released. Cc/CTN in the soil had no correlation with sea level altitude. However, its distribution in the soil x, aried with different vegetation types. （4） Nitrogen in SOM existed mainly in the form of organic nitrogen, and Cc/CTN in the soil was not obvious correlated with SOM and TN.

关键词： Gongga Mountain soil organic matter(SOM) total nitrogen(TN) vertical belt

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vertical distribution changes in land cover between 1990 and 2015 within the Koshi River Basin,Central Himalayas

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Journal of Geographical Sciences 2021年第10期31卷 1419-1436页

作者： WU Xue PAUDEL Basanta ZHANG Yili LIU Linshan WANG Zhaofeng XIE Fangdi GAO Jungang SUN Xiaomin Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Texas A&M AgriLife Blackland Res&Extens CtrTempleTX 76502USA

The study of mountain vertical natural belts is an important component in the study of regional *** areas are especially sensitive to climate change and have indicative function,which is the core of three-dimensional zonality ***,based on high precision land cover and digital elevation model(DEM)data,and supported by MATLAB and ArcGIS analyses,this paper aimed to study the present situation and changes of the land cover vertical belts between 1990 and 2015 on the northern and southern slopes of the Koshi River Basin(KRB).Results showed that the vertical belts on both slopes were markedly different from one *** vertical belts on the southern slope were mainly dominated by cropland,forest,bare land,and glacier and snow *** contrast,grassland,bare land,sparse vegetation,glacier and snow cover dominated the northern *** found that the main vertical belts across the KRB within this region have not changed substantially over the past 25 *** contrast,on the southern slope,the upper limits of cropland and bare land have moved to higher elevation,while the lower limits of forest and glacier and snow cover have moved to higher *** upper limit of alpine grassland on the northern slope retreated and moved to higher elevation,while the lower limits of glacier and snow cover and vegetation moved northward to higher *** in the vertical belt were influenced by climate change and human activities over *** was mainly controlled by human activities and climate warming,and the reduced precipitation also led to the abandonment of cropland,at least to a certain *** in grassland and forest ecosystems were predominantly influenced by both human activities and climate *** the same time,glacier and snow cover far away from human activities was also mainly influenced by climate warming.

关键词： vertical belt land cover Central Himalayas Koshi River Basin climate change

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