Effects of land-use types on soil organic carbon stocks:a case study across an altitudinal gradient within a farmpastoral area on the eastern Qinghai-Tibetan Plateau, China  

作　　者：WANG Fang-ping WANG Xin-chuan YAO Bu-qing ZHANG Zhong-hua SHI Guo-xi MA Zhen CHEN Zhi ZHOU Hua-kun 

机构地区：[1]College of Ecological and Environmental Engineering,State Key Laboratory of Plateau Ecology and Agriculture,Qinghai University,Xining 810015,China [2]Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province,Northwest Institute of Plateau Biology,Chinese Academy of Sciences,Xining 810008,China [3]Key Laboratory of Adaptation and Evolution of Plateau Biota,Chinese Academy of Sciences,Xining 810008,China [4]Farm of Good Forage Grass Breeding in Qinghai Province,Tongde 813201,China [5]College of Bioengineering and Biotechnology,Tianshui Normal University,Tianshui 741000,China [6]Key Laboratory of Medicinal Animal and Plant in Qinghai-Tibetun Plateau in Qinghai Province,Qinghai Normal University,Xining 810008,China [7]University of Chinese Academy of Sciences,Beijing 100o49,China

出　　处：《Journal of Mountain Science》2018年第12期2693-2702,共10页山地科学学报（英文）

基　　金：supported by the National Key Research and Development Project of China (Grant Nos. 2016YFC0501903, 2016YFC0501901);Province Natural Foundation of Qinghai (Grant Nos. 2016-ZJ-910, 2017-S-1-04);the Qinghai Provincial High-end and Innovative 1000 Talents Plan;Qinghai Innovation Platform Construction Project (Grant Nos. 2017-ZJ-Y20, 2017-ZJ-Y13);National Natural Foundation of China (Grant Nos. 31572354, 31472135)

摘　　要：A crucial region for China's ‘Grain-forGreen Policy' is located within a traditional farmpastoral area, between 2000 to 3000 m above sea level, on the eastern Qinghai-Tibetan Plateau.However, the responses of soil organic carbon(SOC) to different land-use patterns in this region are unclear. Here, we determined the SOC(0–20 cm) content of grasslands and forests that are being converted from farmlands, as well as in abandoned arable land and arable land in this region. The factors influencing the reclaimed lands were analyzed along altitudes from 2030 to 3132 m. Our results showed that SOC content was higher for grassland and abandoned arable land than forest and arable land. The SOC content increased with the increase in altitude for total land-use patterns. Further, the grassland and abandoned arable land had higher SOC content than the forest with almost parallel trends along the increase in altitude. However, the proportion of regulated factors of altitude and species richness varied among forest, grassland, and abandoned arable land. Our results indicated that the land-use pattern of returning farmland to grassland and abandoned arable land was more effective in terms of the SOC storage in the superficial layer in this altitude range in the Qinghai-Tibetan Plateau, thereby being beneficial to optimizing land management in this region.A crucial region for China's ‘Grain-forGreen Policy' is located within a traditional farmpastoral area, between 2000 to 3000 m above sea level, on the eastern Qinghai-Tibetan Plateau.However, the responses of soil organic carbon(SOC) to different land-use patterns in this region are unclear. Here, we determined the SOC(0–20 cm) content of grasslands and forests that are being converted from farmlands, as well as in abandoned arable land and arable land in this region. The factors influencing the reclaimed lands were analyzed along altitudes from 2030 to 3132 m. Our results showed that SOC content was higher for grassland and abandoned arable land than forest and arable land. The SOC content increased with the increase in altitude for total land-use patterns. Further, the grassland and abandoned arable land had higher SOC content than the forest with almost parallel trends along the increase in altitude. However, the proportion of regulated factors of altitude and species richness varied among forest, grassland, and abandoned arable land. Our results indicated that the land-use pattern of returning farmland to grassland and abandoned arable land was more effective in terms of the SOC storage in the superficial layer in this altitude range in the Qinghai-Tibetan Plateau, thereby being beneficial to optimizing land management in this region.

关 键 词：Soil organic carbon GRAIN for Green program FARMING land Qinghai-Tibetan PLATEAU 

分 类 号：P[天文地球]