干旱区生态环境知识资源中心(Arid): 香格里拉大峡谷土壤特性及其人为活动影响研究

Arid

	香格里拉大峡谷土壤特性及其人为活动影响研究
其他题名	Soil characteristics in shangri-la canyon and impact of human activities
	田昆 1; 贝荣塔 2; 常凤来 2; 陆梅 2; 莫剑锋 2
来源期刊	土壤
ISSN	0253-9829
出版年	2004
卷号	36 期号:2 页码:203-207
中文摘要	分析了长江上游香格里拉大峡谷的土壤特性及人为活动对生态环境造成的影响，结果表明：大峡谷土壤垂直分异明显，从海拔2000～5545 m分布有9种土壤类型。土壤C／N比值较大，反映了以有机质积累为主的土壤发育过程。自然土壤有机质平均含量100 g／kg，垦为坡耕地降至28．7 g／kg，撂荒地降至22．3 g／kg，旅游活动、过牧超载等人为干扰同样引起生态退化，自然干扰如火灾也引起土壤养分下降。另外，气候寒冷造成土壤利用性能受限，植被生长缓慢且破坏后难于恢复，对长江下游及附近地区自然环境的形成与演变产生重大影响。
英文摘要	The soils characteristics and impacts of human disturbances on the ecosystem of the Shangri-La Canyon were studied. The results show that 9 soils are distributed in clearly vertical zonation from 2,000m to 5,545m in altitude. The ratio of C/N in the soils is high, indicating that in the Shangri-la Canyon the soil formation processes were dominated with accumulation of organic matter. The average content of organic matter in the natural soil under forests is 100 g/kg, but is reduced to 28.7 g/kg after the soil has been cultivated as sloping cropland and to 22,3 g/kg in deserted farmland, which is evidence of soil degradation under the impact of human activities. On mire soil, harmful and poisonous weeds, such as Euphorbia jolkinii and Artemisia hedinii representative of soil degradation, are intruding into the meadow as a result of over-grazing. Soil degradation also occurs under the impact of nature disturbance such as forest fire. Moreover, the soil in the Shangri-la Canyon is higher than the soils in the other mountains areas in Yunnan, but cold weather limits the soil productivity and plant growth. Once the vegetation is destroyed, it is very hard to restore it. Thus the loss of forests with their function of conserving of water supply threatens the natural eco-environment in the vicinity and the down-streams of the Yangtze River catchment.
中文关键词	香格里拉大峡谷
英文关键词	Shangri-la Canyon
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:1626519
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205539
作者单位	1.中国科学院东北地理与农业生态研究所, 长春, 吉林 130012, 中国; 2.西南林学院环境科学与工程系, 昆明, 云南 650224, 中国
推荐引用方式 GB/T 7714	田昆,贝荣塔,常凤来,等. 香格里拉大峡谷土壤特性及其人为活动影响研究[J],2004,36(2):203-207.
APA	田昆,贝荣塔,常凤来,陆梅,&莫剑锋.(2004).香格里拉大峡谷土壤特性及其人为活动影响研究.土壤,36(2),203-207.
MLA	田昆,et al."香格里拉大峡谷土壤特性及其人为活动影响研究".土壤 36.2(2004):203-207.