Methods and mechanisms for enhancing the water retention properties of Jiuzhaigou disintegrated rubble soils  

作　　者：WEI Zeming XI Hongchao PEI Xiangjun ZHANG Xiaochao QIU Mao HUANG Tiao WANG Zhaocheng JIANG Junlian DU Jie JIAN Daijun 

机构地区：[1]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China [2]Tianfu Yongxing Laboratory Research Center for Carbon Sequestration and Ecological Restoration,Chengdu 610213,China [3]Jiuzhaigou Administration,Aba 623400,China

出　　处：《Journal of Mountain Science》2025年第2期729-746,共18页山地科学学报(英文)

基　　金：jointly funded by the Sichuan Provincial Natural Science Foundation of China(Grant No.2023NSFSC0378);the Jiuzhaigou Lake Swamp and River Ecological Restoration Research Project(N5132112022000246);the Research base and Support provided by Jiuzhaigou Administration for this study。

摘　　要：Rubble deposits with a high concentration of rock debris were created after the powerful earthquakes in Jiuzhaigou.Because of the restricted soil resources,water leaks,and nutrient deficits,these deposits pose serious obstacles for vegetation regeneration.The purpose of this study was to investigate the main mechanisms controlling soil water retention and evaluate the effects of different amendments on the hydraulic characteristics and water-holding capacity of collapsed rubble soils.Finegrained soil,forest humus,crushed straw,and organic components that retain water were added to the altered soils to study the pore structure images and soil-water characteristic curves.Comparing understory humus to other supplements,the results showed a considerable increase in the soil's saturated and wilting water content.The saturated water content and wilting water content rose by 17.9%and 4.3%,respectively,when the percentage of understory soil reached 30%.Additionally,the enhanced soil's microporosity and total pore volume increased by 45.33%and 11.27%,respectively,according to nuclear magnetic imaging.It was shown that while clay particles and organic matter improved the soil's ability to adsorb water,they also increased the soil's total capacity to store water.Fine particulate matter did this by decreasing macropores and increasing capillary pores.These results offer an essential starting point for creating strategies for soil repair that would encourage the restoration of plants on slopes that have been damaged.

关 键 词：Pile-ups Amendments Crumbling rubble soils Water holding capacity Soil-water characteristic curves 

分 类 号：X171.4[环境科学与工程—环境科学] S714[农业科学—林学]