干旱区生态环境知识资源中心(Arid): 阿拉善主要草地类型土壤有机碳特征及其影响因素

Arid

	阿拉善主要草地类型土壤有机碳特征及其影响因素
其他题名	Organic carbon content in major grassland types in Alex,Inner Mongolia
	傅华 1; 陈亚明 2; 王彦荣 1; 万长贵 1
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:3 页码:469-476
中文摘要	以阿拉善左旗境内贺兰山中段(西坡)及其山前地带主要草地类型为研究对象，分析了不同草地类型土壤有机碳(SOC)的分布特征及其与气候因子、植被特征和土壤特性的关系。结果表明：土壤有机碳含量随海拔高度的降低而逐渐降低，其垂直分异规律是：山地荒漠草原沿土壤剖面依次降低，高山草甸、草原化荒漠和沙砾质草原化荒漠0～20cm与20～40cm土层差异不显著，但高于40～60cm土层。0～20cm和20～40cm土层土壤有机碳含量与年降水量、植被盖度、草地生产力、土壤含水量和<0.05mm颗粒含量呈极显著正相关，与年均温、土壤pH值呈极显著负相关(P<0．001)。偏相关分析显示，影响0～20cm土层有机碳含量最主要的因素是植被盖度、草地生产力和年降水量，而影响20～40cm土层有机碳含量的最主要因素是草地生产力和植被盖度。放牧与围封对荒漠草地土壤有机碳含量有显著影响．在重度放牧下0～20cm土壤有机碳含量明显低于轻、中度放牧处理(P<0.05)；重度退化草地围封3a后土壤有机碳含量比自由放牧草地显著增加。研究区沙砾质草原化荒漠区0～20cm土层土壤有机碳含量在15a持续过度放牧后下降了25.2％。
英文摘要	This study analyzed soil organic carbon content (SOC) in major types of grassland along the middle range of Helan mountain in Alex,Inner Mongolia. Factors affecting carbon distribution such as annual precipitation, temperature, plant cover and productivity, soil water content, <0. 05mm particle content and soil pH were also monitored. Results indicate that soil organic carbon content declined with a decrease in Altitude according to the following order: alpine meadow >mountainous desert steppe>steppe desert>Gobi steppe desert. In the mountainous desert, soil organic carbon content showed a decline along the vertical soil profile. In the Alpine meadow,steppe desert and Gobi steppe desert, soil organic carbon content showed no difference between the 0 - 20cm and 20--40cm soil layers, but SOC was higher in these layers than in the 40-60cm layers. Soil organic carbon in the 0～20cm and 20~-40cm layers was positively correlated with annual precipitation.plant cover, plant productivity, soil water content. and< 0.05mm particle content (P<0. 001). and negatively correlated with average temperature and soil pH(P<0. 001). The most important factors affecting SOC in the 0 - 20cm soil layers, were plant cover (C), plant productivity (B) and annual precipitation(AP), and their relationship can be described as follows; SOC = 0. 0209C + 0. 00389B+0. 00337AP-0. 486 (R~2 = 0. 995). To the 20-40cm soil layers, SOC was mostly affected by productivity and plant cover: SOC = 0. 0117B + 0. 00831C -0. 0294(R~2 = 0. 984). Among the environmental factors,soil water content (W), and average temperature (T) affected SOC in the 0 -20cm layers the most; SOC = 0. 0526W-0. 314T+2. 632(R~2 = 0. 956),with W being positive and T negative. To the 20-40cm soil layer, SOC was mostly affected by average temperatureCT) and annual Grazing and exclusion also affected SOC significantly, heavy grazing reduced SOC more than medium and Sight grazing (P <0. 05) through it’s effects on plant cover and productivity .Three years after the heavily grazed pasture was excluded from grazing, SOC was significant higher than in the pastures that had been freely grazed, In steppe desert, SOC was 0. 247% + 0. 0541 % , because of over grazing, SOC decreased 25.2% in 15 years.
中文关键词	阿拉善
英文关键词	Alxa
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:1645320
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/2XILL650/205344
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.兰州大学生命科学系, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	傅华,陈亚明,王彦荣,等. 阿拉善主要草地类型土壤有机碳特征及其影响因素[J]. 兰州大学,2004,24(3):469-476.
APA	傅华,陈亚明,王彦荣,&万长贵.(2004).阿拉善主要草地类型土壤有机碳特征及其影响因素.生态学报,24(3),469-476.
MLA	傅华,et al."阿拉善主要草地类型土壤有机碳特征及其影响因素".生态学报 24.3(2004):469-476.