水土保持研究2024,Vol.31Issue(1):18-26,9.DOI:10.13869/j.cnki.rswc.2024.01.043
黄土丘陵区草地地上生物量及土壤水分养分对微地形变化的响应
Responses of Aboveground Biomass and Soil Moisture and Nutrients to Microtopographic Changes in Grassland in the Loess Hilly Region
摘要
Abstract
[Objective]In complex terrain areas,it is of great significance for rational utilization and scientific management of grassland ecosystem to understand the impact of terrain changes on grassland productivity and soil moisture and nutrients,so as to provide reference and basis for ecological restoration and productivity maintenance in complex terrain areas of grassland ecosystem.[Methods]The grassland ecosystem in the loess hilly area was taken as the research object,the above ground biomass of grassland,the contents of soil organic carbon,total nitrogen and total phosphorus of 0-40 cm and soil moisture of 0-100 cm were studied by using one-way analysis of variance,Duncan's multiple comparison and Pearson correlation analysis.[Results](1)On the sunny slope,aboveground biomass decreased gradually with the decrease of slope position and showed a highly significant difference.The contents of SOC and STN decreased with the slope position decreasing,and the content of STP changed in a V-shaped pattern with the decrease of slope position.On the shady slope,aboveground biomass showed an increasing trend with the decrease of slope position.The content of STP increased with the decrease of the slope position.There were significant differ-ences in SOC,STN and STP contents in different slope directions and positions.(2)The contents of SOC,STN and STP all decreased with the deepening of soil layer,and the content of total phosphorus didn't change significantly.The average moisture contents of the six microtopography increased with the increase of soil depth,and there were significant differences among the soil moisture contents of the six microtopogra-phy in the soil layer greater than 40 cm.(3)Correlation analysis showed that STP in 0-20 cm soil layer was significantly negatively correlated with aboveground biomass,SOC in 20-40 cm soil layer was significantly positively correlated with aboveground biomass,and SWC in 40-80 cm soil layer was significantly positively correlated with aboveground biomass.The multiple linear regression analysis equation showed that the combined effect of SOC,STP and SWC in the topsoil layer at vertical height had the effect on aboveground biomass with an explanation of 69.4%.[Conclusion]Microtopography had a significant distribution effect on aboveground biomass,soil organic carbon,total nitrogen,total phosphorus and soil moisture contents.In the topsoil layer,soil organic carbon,total phosphorus and soil moisture contents were significantly correla-ted with aboveground biomass,and had a certain influence on aboveground biomass.关键词
草地生态系统/微地形/土壤有机碳/土壤全氮/土壤全磷/土壤含水量/地上生物量Key words
grassland ecosystem/microtopography/SOC/STN/STP/SWC/aboveground biomass分类
农业科技引用本文复制引用
崔梦莹,周荣磊,郑诚,魏嘉琪,万锦枫,赵一帆,温仲明..黄土丘陵区草地地上生物量及土壤水分养分对微地形变化的响应[J].水土保持研究,2024,31(1):18-26,9.基金项目
国家自然科学基金项目"黄土丘陵沟壑区植被水沙拦蓄效率变化与水文连通性响应"(41977077) (41977077)