干旱区生态环境知识资源中心(Arid): 不同退化红砂荒漠草地的水分分配格局

Arid

	不同退化红砂荒漠草地的水分分配格局
其他题名	Water distribution patterns in different degraded desert gasslands of Reaumuria soongorica
	王彦荣 1; 曾彦军 1; 张宝林 2; 塔拉腾 2
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2002
卷号	13 期号:8 页码:962-966
中文摘要	研究了内蒙古阿拉善盟不同过牧退化红砂草地的土壤-植物-大气系统的水分分配格局，不同退化草地和主要植物种的水分利用效率，2001年降雨量124.3mm，其中试验期119.4mm，1m深土壤水分结果表明，10-40cm土层受蒸散影响最大；由于主要共存种红砂和无芒隐子草根系分布和蒸腾强度不同等，含水量在10-20cm土层以中度嫁化区显著低于其它样区（P<0.05)。而20-40cm土层以轻度退化区较低，样地年均蒸发量为30.6mm，红砂种群的年均蒸腾量为11.9mm，随着草地退化加剧，裸地的蒸发量和退化指示种匍根骆驼蓬种群的蒸腾量增加，而红砂种群的蒸腾量降低，与较轻度退化区比，中度和重度退化区的水分利用率分别下降了14.6和46.1，红砂水分利用率分别下降了37.8和73.8。
英文摘要	Water distribution pattern and water use-efficiency in soil-plant-atmosphere system for light, medium, and heavy degraded Reaumuria soongorica grasslands were studied in Alashan region of Inner Mongolia. The total precipi-tation in 2001 was 124.3mm, of which 119.4mm occured during experimental period. Soil water content (SWC) in 10～40cm layer was greatly affected by the evapotranspiration. The SWC in 10～20cm layer of medium degraded grassland paddock was significantly lower (P < 0.05), and the SWC in 20～40cm layer of light degraded paddock was lower than that of other paddocks due to different transpiration rate and root distri-bution depth between the main co-existing plant species of R. soongorica and Cleistogenes soongorica in the pad-docks. The annual average bare land evaporation and R. soongorica population transpiration were 30.6mm and 11.9mm, respectively. As the grassland further degraded, the bare land evaporation and transpiration through Peganum nigellastrum population, a degradation indicating plant species, increased, while the transpiration of R- soongorica decreased. In addition, the water use-efficiency of the grassland and dominant plant species markedly decreased with the increasing grassland degradation. Compared to the light degraded paddocks, for in-stance, the water use-efficiency of medium and heavy degraded paddocks were reduced by 14.6% and 46.1% for total biomass production, and by 37.8% and 73.8% for R. soongorica, respectively.
中文关键词	草地退化 ; 过牧 ; 退化红砂荒漠草地 ; 水分分配格局
英文关键词	Reaumuria soongorica desert over grazing grassland degradation water distribution
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:1114023
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/203553
作者单位	1.兰州大学草地农业科技学院甘肃草原生态研究所, 兰州, 甘肃 730020, 中国; 2.内蒙古阿拉善盟草原工作站, 巴彦浩特, 750360
推荐引用方式 GB/T 7714	王彦荣,曾彦军,张宝林,等. 不同退化红砂荒漠草地的水分分配格局[J]. 兰州大学,2002,13(8):962-966.
APA	王彦荣,曾彦军,张宝林,&塔拉腾.(2002).不同退化红砂荒漠草地的水分分配格局.应用生态学报,13(8),962-966.
MLA	王彦荣,et al."不同退化红砂荒漠草地的水分分配格局".应用生态学报 13.8(2002):962-966.