Drainage of paddy terraces impacts structures and soil properties in the globally important agricultural heritage of Hani Paddy Terraces,China  

作　　者：Ming Wang Li Rong Yanbo Li Jiangcheng Huang Yuanmei Jiao Xiaoyan Wei 

机构地区：[1]Institute of International Rivers and Eco-Security,Kunming,650500,China [2]Yunnan Key Laboratory of International Rivers and Transboundary Eco-Security,Kunming,650500,China [3]Power China Kunming Engineering Corporation Limited,Kunming,650051,China [4]Department of Geography,Yunnan Normal University,Kunming,650500,China [5]Yunnan Provincial Archives of Surveying and Mapping(Yunnan Provincial Geomatics Centre),Kunming,650032,China

出　　处：《International Soil and Water Conservation Research》2024年第1期64-76,共13页国际水土保持研究（英文）

基　　金：This work was supported by the National Natural Science Foundation of China[grant numbers 41501592,42061044,42061074].The authors would like to thank Professor Xingwu Duan of Yunnan University for suggestions for experimental design and Jiancheng Deng of Yunnan University and the villagers of Amengkong for their assistance in fieldwork.

摘　　要：Marginalization and abandonment of paddy terraces are widespread,but their effects on the sustainability of subsequent agricultural production are still unknown.Hani Paddy Terraces,included in Globally Important Agriculture Heritage Systems,are threatened by paddy fields drainage.Here,changes in terrace structure,the productivity of topsoil(0-20 cm),and soil water holding capacity at 0-70 cm depth were determined in a case study of Hani Paddy Terraces in Amengkong River Basin in Yuanyang County in Southwestern China,which had been converted into dryland terraces for 2-14 years.Our results showed that:(1)The degree of terrace structures degradation exhibited a U-shaped curve with increasing time since draining,with those drained for 5-9 years having the best structure;(2)Soil productivity index decreased first and then increased with time after conversion;(3)Maximum water holding capacity at 0-70 cm soil depth dramatically decreased after conversion and such trend became increasingly obvious with increasing time since conversion.Our study revealed that drainage of paddy terraces along with associated changes in crop and field management led to an increase in soil productivity,but degradation of terrace structures and a decrease in water holding capacity will inhibit restoration to paddy terraces.These findings enhance the understanding of the biophysical changes due to marginalization in paddy terraces.

关 键 词：Hani paddy terraces Terraces marginalization Terrace structure degradation Soil productivity Water holding capacity 

分 类 号：S157[农业科学—土壤学]