若尔盖地区草地沙化特征研究
Study on the desertification mechanism of the grassland in Zoige
张芮嘉 1龙建 1蒋伟 1梁玉祥1
作者信息
- 1. 四川大学化工学院,四川成都610065
- 折叠
摘要
研究了若尔盖地区不同退化程度的草地土壤理化性质随土壤深度（0～60cm）的变化特征和草地的沙化机制。结果表明：草地退化是以0～30cm土层,土壤N、有机质和腐殖酸的流失为主要特征,当三者的流失率分别达到95.45%、98.85%、98.36%时,土壤P、K含量降低,草地盖度下降、生物量减少;随着草地退化程度的加深,在0～30cm土层,土壤水分含量不断降低而沙含量不断升高,全沙化草地水分含量在5%以下,沙含量达到98%;草地沙化从0～30cm土层开始,尤其是在20cm,土壤水分含量和沙含量的变化使得该土层成为沙化敏感区。
Abstract
Physicochemical characteristics of soil in different degradatied grassland in Zoige were analyzed based on the soil layer(0-60 cm). The results showed,the grassland degradation was characterized by the loss of soil ni 45%,98. creased. with the tion was trogen, organic matter and humus in the soil layer with 0-30 cm. When the w 85 % and 98.36 %, the content of soil phosphorus and potassium declined, the bi In the soil layer with 0-30 cm,moisture declined gradually,and the sediment degrad 98%. changes of mois ation deepening. The moisture of d Grassland degradation began in the ture and sediment concentration ma astage rate reached 95. omass and coverage de concentration increased esertified point was below 5%, and the sediment eoneentra- soil layer with 0-30 era,especially in 20 cm depth,and the de this layer become the desertification sensitive zone.
关键词
若尔盖/草地/沙化特征/养分含量/有机质Key words
Zoige/desertification characters/nutrient content/organic matter/desertification mechanism引用本文复制引用
基金项目
科技部国际合作重大项目(2007DFA90570)
出版年
2012
国家科技期刊平台
NSTL
维普
万方数据