干旱区生态环境知识资源中心(Arid): 甘肃省民勤沙区土壤结皮理化性质研究

Arid

	甘肃省民勤沙区土壤结皮理化性质研究
其他题名	The study on the physical and chemical characteristics of sand soil crust in the Minqin County, Gansu Province
	贾宝全 1; 张红旗 2; 张志强 3; 慈龙骏 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2003
卷号	23 期号:7 页码:1442-1448
中文摘要	以甘肃民勤沙区为研究区域，分别采集了不同地貌部位和不同植被类型下的土壤结皮，并对其理化性质进行了初步分析。从结皮土壤的机械组成、土壤盐分、土壤养分、土壤阳离子交换量等方面来看，丘间地状况都明显要优于灌丛沙包。这可能与丘间地地形低洼，有利于土壤物质汇聚，以及其接受的大气降尘远较灌丛沙包为多有关。对于灌丛沙包来讲，白刺沙包在理化性质上，其状况要优于红柳结皮和梭梭结皮，这主要与其对环境的适应性及其所处的演替阶段有关。从目前的植被演替情况来看，白刺是当地的顶极种群，最适应环境，因此结皮发育状况也好；红柳目前已经处于极度退化进程中，而梭梭为人工植被，人工植被因在演替阶段中不起决定作用，故理化性质较差。另外从该研究工作还可以看出，对白刺植被采取围封措施之后，可以显著地促进结皮的生长发育，提高结皮中的有机质、全N、全P、速效N等养分以及CaCO_3含量。
英文摘要	Taking the Minqin county as the research region, the sand soil crust sample in different geomorphic site and plant community were collected, and its physical and chemical characteristics were analyzed, in which the soil mechanical composition, soluble salt, soil nutrient elements, organic matter, Ph value, CEC and CaCO3 content were included. The result showed that whether in the sand dune or the takyr soil, the crust soil mechanical composition is mostly composed by sand (l~0.05mm) and coarse silt particle (0.05～0.01mm). The total salinity is the highest in the takyr soil crust than in any other soil crust, but in the shrub sand dune, the physical soil crust and the Tamarix ramosissima soil crust is highest, and changes of the total cation and anion has the same changing trend. The Nitraria tangutorum soil crust and the takyr soil crust have the higher CEC, and this shows that they have the higher ability in keeping soil fertility. The pH value all is bigger than 7 in different soil crust. The CaCO3 content in takyr soil is the highest, but in shrub sand dune the situation is that closed Nitraria tangutorum > Nature Nitraria tangutorum community > Tamarix ramosissima community ^-artificial Haloxylon ammodendron community. In the soil crust nutrient aspects, Nitraria has the highest fertilizer and the artificial Haloxylon ammodendron community has the lowest fertilizer. If we set the top soil of the shifting sand dune and physical soil crust as a background, we can found that the content of Total N, Total P, rapidly available N and rapidly available P is decreased and rapidly available is increased after crust developing. For the integrated view, the result shows that the physical and chemical characteristics of soil crust is better in the takyr soil and Nitraria tangutorum, especially in the closed Nitraria tangutorum. There are three reasons result from above conclusions. The first one is that the takyr soil has the lower microlandform which conduce to rain water and soil matter to congregated in it. The second one is that the takyr soil has a bigger open space than that of shrub sand dune. so it can receive more sand dust matter which is very important for the soil crust development. The third one is the adaptability of plant to environment and its succession process. Under present situation, Nitraria tangutorum is the climax species in this region, and Tamarix ramosissima is in the degenerate stage, so the soil crust developing state under the former plant is better than that of the latter. From our research, we found that the Nitraria tangutorum soil crust develop better after enclosed, in which the organic matter, total N. Total P and rapidly available nutrient were enhanced rapidly. Because the degradation of vegetation and soil is very serious in desert-oasis region, the artificial close measurement is a availability way to combat this process.
中文关键词	绿洲荒漠区 ; 土壤结皮 ; 理化性质 ; 民勤 ; 甘肃
英文关键词	desert-oasis region soil crust physical and chemical characteristics Minqin County Gansu Province
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ECOLOGY
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:1268356
来源机构	中国科学院地理科学与资源研究所 ; 北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/204289
作者单位	1.中国林业科学院林业研究所, 北京 100091, 中国; 2.中国科学院地理科学与资源研究所, 北京 100101, 中国; 3.北京林业大学, 教育部水土保持与荒漠化防治重点实验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	贾宝全,张红旗,张志强,等. 甘肃省民勤沙区土壤结皮理化性质研究[J]. 中国科学院地理科学与资源研究所, 北京林业大学,2003,23(7):1442-1448.
APA	贾宝全,张红旗,张志强,&慈龙骏.(2003).甘肃省民勤沙区土壤结皮理化性质研究.生态学报,23(7),1442-1448.
MLA	贾宝全,et al."甘肃省民勤沙区土壤结皮理化性质研究".生态学报 23.7(2003):1442-1448.