干旱区生态环境知识资源中心(Arid): 梭梭幼苗死亡与土壤和大气干旱的关系研究

Arid

	梭梭幼苗死亡与土壤和大气干旱的关系研究
其他题名	Relationship Between Haloxylon ammodendron Seedling Mortality and Water Content in Soil and Atmosphere
	田媛 1; 李建贵 1; 赵岩 2
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2010
卷号	30 期号:4 页码:878-884
中文摘要	以古尔班通古特沙漠南缘沙漠中的一年生梭梭幼苗为研究对象，对环境气象因子、土壤含水率、幼苗根系垂直伸展状况、幼苗死亡动态进行了全生长期的连续监测研究。结果表明，尽管梭梭幼苗根系伸展迅速，当年可达 1．5 m，幼苗死亡率动态变化仍然与土壤表层含水率显著相关，而与根区或深层含水率不显著相关。但统计分析结果显示，土壤表层含水率并不总是梭梭幼苗死亡率波动的主导因素。当土壤含水率低至0．82％时，无论大气干旱程度如何，幼苗死亡率都急剧升高；而当土壤含水率高于1．25％时，幼苗可以耐受大气干旱，幼苗死亡只与土壤表层含水率显著相关；当土壤含水率在0．82～1．25％之间时，幼苗死亡率与大气干旱程度(空气饱和差)显著相关。据此我们推测，当土壤表层含水率低于1．25％时。，大气干旱主导死亡率的变化；反之，则土壤水分主导。
英文摘要	Field monitoring of Haloxylon ammodendron seedling mortality, root extension, soil water content and meteorological factors during the whole growing season of first-year Haloxylon ammodendron was carried out at the southern boundary of the Gurbantunggut desert. The results showed that the Haloxylon ammodendron seedling mortality had a significant correlation with water content in surface soil, and the correlation between Haloxylon ammodendron seedling mortality and water content in deep soil wasn’t significant despite the seedling roots stretching downward quickly, up to the depth of 1. 5 meter in one year. However, the statistical analysis indicated water content in surface soil was not the only factor influencing the Haloxylon ammodendron seedling mortality. The Haloxylon ammodendron seedling mortality increased dramatically when the water content in surface soil decreased as low as 0. 82%, regardless of the degree of air water deficit in air; The Haloxylon ammodendron seedlings could tolerate water deficit in air when the water content in surface soil was higher than 1. 25% and the water content in surface soil determined the seedling mortality. There was a significant correlation between Haloxylon ammodendron seedling mortality and water content in air when water content in surface soil was at 0. 82% 1. 25 %. It was concluded that water content in air determined the Haloxylon ammodendron seedling mortality when the water content in surface soil was less than 1. 25% and water content in surface soil determined the Haloxylon ammodendron seedling mortality when the water content in surface soil was higher than 1. 25%.
中文关键词	幼苗死亡率 ; 土壤含水率 ; 空气饱和差 ; 根系伸展 ; 梭梭
英文关键词	seedlings mortality soil water content vapor pressure deficit root extension Haloxylon ammodendron
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3897102
来源机构	新疆农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226010
作者单位	1.新疆农业大学林学院, 乌鲁木齐, 新疆 830052, 中国; 2.中国科学院新疆生态与地理研究所阜康荒漠生态站, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	田媛,李建贵,赵岩. 梭梭幼苗死亡与土壤和大气干旱的关系研究[J]. 新疆农业大学,2010,30(4):878-884.
APA	田媛,李建贵,&赵岩.(2010).梭梭幼苗死亡与土壤和大气干旱的关系研究.中国沙漠,30(4),878-884.
MLA	田媛,et al."梭梭幼苗死亡与土壤和大气干旱的关系研究".中国沙漠 30.4(2010):878-884.