水土保持研究2024，Vol.31Issue(2)：33-42,10.DOI:10.13869/j.cnki.rswc.2024.02.034
喀斯特退耕地不同植被恢复阶段土壤团聚体稳定性特征
Characteristics of Stability of Soil Aggregates at Different Vegetation Restoration Stages in Karst Reclaimed Land
摘要
Abstract
[Objective]The aims of this study are to investigate the effects of cropland fallowing on soil struc-ture and stability in the development areas of yellow and calcareous soils in Qianzhong Karst Region,and to provide theoretical basis for the prevention and control of soil erosion and evaluation of the benefits of revege-tation of fallowed cropland in karst region.[Methods]Differential characteristics of soil aggregate composi-tion and stability in shallow(0-30 cm)soil layers of cropland(YM)and different stages of vegetation resto-ration after fallow[grassland(CD),scrubland(GC),and woodland(LD)]were investigated based on the wet-dry sieve method.[Results]The contents of soil mechanical aggregates in the two types of soil develop-ment areas decreased with the decrease of particle size,and the content of water stable aggregates decreased at first and then increased with the decrease of particle size,and the main content of soil mechanical aggre-gates was>1 mm aggregate,and the proportions of yellow loam and lime soil were 82.45% and 84.01%,respectively.The water stable aggregates were mainly>2 mm aggregate,accounting for 53.53% and 54.61%,respectively.The mean weight diameter(MWD)and geometric mean diameter(GMD)of aggre-gates in yellow soil decreased with the increase of soil depth,while the opposite trend in calcareous soil to that in yellow soil was found.Cluster stability of yellow soil fallow land was better compared to calcareous soils.In general,the MWD and GMD of the two soils were the lowest in YM,and the soil structure damage rate(PAD)was the highest,the stability of soil aggregates in YM was the lowest,and the stability of soil aggregates in different stages of vegetation restoration was improved compared with that in YM.MWD of yellow soil was significantly positively correlated with organic matter content(SOM)and total nitrogen(TN),GMD was significantly positively correlated with SOM,and PAD was significantly positively correla-ted with silt(p<0.05).MWD and GMD of calcareous soil were significantly positively correlated with sand and total potassium(TK)(p<0.05),and negatively correlated with total phosphorus(TP).PAD was sig-nificantly negatively correlated with sand and TK,positively correlated with TP(p<0.01),and positively correlated with clay(p<0.05).The results of multivariate analysis of variance showed that vegetation type,soil depth and soil type had significant effects on soil aggregate stability(p<0.05).[Conclusion]In the two soil development areas,the soil aggregate stability indexes of different vegetation recovery stages after fallow are higher than those of cultivated land,which shows that fallow returning forest to grass effectively improves the stability of soil aggregate and strengthens the ability of soil to resist erosion,and the results of this study can provide theoretical basis for the deployment of soil and water conservation measures and the evaluation of the benefits of fallow land in the karst area.关键词
喀斯特/黄壤/石灰土/不同退耕植被/团聚体稳定性Key words
karst/yellow soil/calcareous soil/different vegetation for returning farmland/aggregate stability分类
农业科技引用本文复制引用
董天富,邓志豪,杨静,戴全厚,聂云鹏..喀斯特退耕地不同植被恢复阶段土壤团聚体稳定性特征[J].水土保持研究,2024,31(2):33-42,10.基金项目
国家自然科学基金(42161009,41807175,31971438) （42161009,41807175,31971438）
贵州省科学技术基金(黔科合基础-ZK[2021]一般223) （黔科合基础-ZK[2021]一般223）
