砾石覆盖下土壤侵蚀过程中有机碳转移数量特征  

Quantitative Characteristics of Organic Carbon Transfer during Soil Erosion under Gravel Cover

作　　者：梁万栋 王小姣 高志康 田方霄 赵卓 喻武[1] LIANG Wandong;WANG Xiaojiao;GAO Zhikang;TIAN Fangxiao;ZHAO Zhuo;YU Wu(Resources&Environment College,Xizang Agricultural and Animal Husbandry University,Linzhi Xizang,860000,China)

机构地区：[1]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《高原农业》2024年第2期181-187,共7页Journal of Plateau Agriculture

基　　金：国家自然科学重点基金(41930754);西藏农牧学院农业资源与环境学科建设开放课题-研创项目(533320003)。

摘　　要：青藏高原对气候变化响应敏感,且具有提前的征兆,由于全球变暖的原因,冻土的融化会使冻土中所含的碳化合物以温室气体的形式排到大气中,从而进一步加剧全球变暖,本研究利用野外实地调查和采挖土壤侵蚀区的土壤到室内实验室采用模拟径流冲刷法对土壤进行实验,主要得到:(1)当坡面土壤无砾石覆盖时,随着坡度的增加,有机碳的流失量也随之增加;(2)相比没有砾石覆盖的坡面土壤,砾石覆盖度为40%和70%时的土壤有机碳流失量显著大于裸坡的有机碳流失量;(3)随着砾石覆盖度的增加,砾石体积对土壤的破坏力增强,最终使有机碳失去物理保护而迁移流失,造成土壤有机碳流失量增加。由以上结论得出,在今后的裸坡地带进行水土流失预防和治理时应注重削减坡度的方式来减缓土壤侵蚀的发生和有机碳的流失。The Qinghai-Xizang Plateau is sensitive to climate change and has early signs.Due to global warming,the melting of permafrost will cause carbon compounds contained in permafrost to be released into the atmosphere in the form of greenhouse gases,further exacerbating global warming.This study utilized field surveys and laboratory experiments,employing simulated runoff erosion techniques on soil samples collected from erosion-prone areas.The main results found an increase in slope steepness lead to a higher loss of organic carbon in the absence of gravel coverage on sloped soil.Moreover,compared with slopes without gravel coverage,slopes with 40%and 70%gravel coverage had significantly greater soil organic carbon losses.As gravel coverage intensifies,it exerted a more destructive impact on the soil,ultimately causing the loss of physical protection for organic carbon,thereby increasing soil organic carbon loss.These findings underscore the importance of reducing slope steepness in future soil erosion prevention and control efforts in bare slope areas to mitigate both soil erosion and organic carbon loss.

关 键 词：砾石覆盖 土壤侵蚀 有机碳流失 

分 类 号：S157[农业科学—土壤学]