干旱区生态环境知识资源中心(Arid): 退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响

Arid

	退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响
其他题名	Changes in soil particles fraction and their effects on stability of soil-vegetation system in restoration processes of degraded sandy grassland
	张继义 1; 赵哈林2
ISSN	1674-5906
出版年	2009
卷号	18 期号:4 页码:1395-1401
中文摘要	通过对不同恢复程度的6个退化沙质草地群落样地的土壤取样,分析了土壤颗粒组成,进行了饱和持水量和土壤粘结力与结持性能的室内试验与测定.结果表明:在退化最为严重和沙漠化程度最高的群落1,土壤颗粒组成以0.25～0.10 nm的细砂和0.50～0.25 mm的中砂等粗粒成分为主,其质量分数分别为77.62%和19.02%;而0.10～0.05 mm的极细砂和<0.05 mm的粘粉粒等细粒成分的质量分数极低,分别为1.65%和1.67%.土壤颗粒组成的这种特征是沙漠化过程土壤各级颗粒受到强烈分选、土壤组成粗粒化的反映.退化沙质草地恢复过程土壤颗粒组成的变化主要表现为:粘粉粒和极细砂质量分数显著上升,在恢复程度最高的群落6分别达到了16.27%和27.38%;细砂质量分数则显著降低,在恢复程度最高的群落6下降到33.85%.极细砂和粘粉粒能够提高土壤持水能力,其质量分数每提高1%,相当于使土壤饱和持水质量分数分别提高0.18%和0.32%;增强土壤的粘结力和抗风蚀能力,是土壤基质的稳定剂,其质量分数每提高1%,相当于使土壤粘结力分别提高0.078 3 kg·cm~(-2)和0.1363 kg·cm~(-3).退化沙质草地恢复过程土壤颗粒组成变化是土壤-植被系统互馈作用、良性发展的指示器,其生态意义在于:引起水分人渗和分配变化,使表层土壤截存的降水量增加,有利于浅根系草本植被发育,而深层土壤水分补给减少,沙地旱化;使土壤基质的黏结力和结持性能增强,稳定性增强,抗风蚀能力提高,进一步推动土壤-植被系统的良性发展,加速恢复进程.
英文摘要	In order to understand changes in soil particles fraction and their effects on soil-vegetation system stability in restoration processes, 6 degraded grassland communities in a sandy desertified region were sampled. Based on the field investigation and lab analysis, the soil particles fraction, soil agglomeration intensity, and water-holding capacity of these 6 communities were studied. The results showed that soil of the most degraded community 1 mainly consisted of 0.25～0.10 mm fine sand and 0.50～0.25 mm middle sand, the quality percentage fraction of which were 77.62% and 19.02%, respectively, while the 0.10~0.05 mm very fine sand and <0.05 mm silt and clay were scarce with a low quality percentage fraction of 1.65% and 1.67%, respectively. This characteristic sug- gested that soil was strongly separated and selected according to particle size by wind in sandy desertification, making soil texture more and more coarse. In the most restored community 6, the quality percentage of very fine sand, silt and clay increased prominently to 27.38% and 16.27% respectively, while that of fine sand decreased to 33.85%. For every 1% enhancement of quality percentage fraction of very fine sand, silt and clay, the quality percentage of holding water after water-saturated enhanced 0.18% and 0.32% respectively, and the agglomeration intensity of soil enhanced 0.078 3 kg·cm~(-2) and 0.136 3 kg·cm~(-2) respectively. It was concluded that changes in soil particles fraction could be an indicator for the feed-back cycle and benign development of soil-vegetation system with ecological significances such as: enhancing soil water-holding capacity, leading to changes in penetration and distribution of soil water, making rainfall is more sequestrated in topsoil, and be in favor of the shallow-root herbaceous plants development; enhancing soil agglomeration intensity, soil-vegetation system stability, and soil endurance to wind erosion, promoting favorable development of soil-vegetation system, and in the end, accelerating restoration process.
中文关键词	土壤 ; 植被 ; 稳定性 ; 颗粒组成 ; 生态意义
英文关键词	soil vegetation stability particles fraction ecological significances
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:3695758
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224014
作者单位	1.兰州理工大学石油化工学院, 兰州, 甘肃 730050, 中国; 2.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张继义,赵哈林. 退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响[J]. 中国科学院西北生态环境资源研究院,2009,18(4):1395-1401.
APA	张继义,&赵哈林.(2009).退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响.,18(4),1395-1401.
MLA	张继义,et al."退化沙质草地恢复过程土壤颗粒组成变化对土壤-植被系统稳定性的影响".18.4(2009):1395-1401.