干旱区生态环境知识资源中心(Arid): 荒漠草原不同种植年限人工柠条林土壤碳氮磷化学计量特征

Arid

	荒漠草原不同种植年限人工柠条林土壤碳氮磷化学计量特征
其他题名	Effects of different planting-years of artificial Caragana intermedia shrubs on soil organic carbon, nitrogen and phosphorus stoichiometry characteristics in desert steppe
	潘军; 宋乃平; 吴旭东; 杨新国; 陈林; 曲文杰; 翟德苹
来源期刊	浙江大学学报. 农业与生命科学版
ISSN	1008-9209
出版年	2015
卷号	41 期号:2 页码:160-168
中文摘要	以荒漠草原不同林龄(9 a,17 a,27 a)人工柠条林为对象,研究不同土层深度以及柠条灌丛不同部位的土壤有机碳(soil organic carbon,SOC)、全氮(total nitrogen,TN)和全磷(total phosphorus,TP)含量及其生态化学计量特征变化规律.结果表明:不同林龄柠条灌丛各部位SOC和TN含量在垂直剖面上的分布具有统计学上的极显著差异(P<0.01);灌丛各部位SOC、TN含量均随林龄增加逐渐增大,且随土层加深逐渐减小,具有明显的表聚性,灌丛各部位均表现为内部>边缘>外部;随着柠条林龄的增长,灌丛各部位土壤TP含量呈逐渐增加的趋势.随着林龄的增长,灌丛各部位土壤C/N均呈现逐渐降低的趋势;而土壤C/P在灌丛内部和边缘呈现先降低后增加的趋势,而在灌丛外部呈现逐渐增加的趋势;土壤N/P在灌丛内部和外部呈现逐渐增加的趋势,而在灌丛边缘呈现先降低后增加的趋势.随着土层深度的增加,土壤C/N呈逐渐增加的趋势,而C/P和N/P整体上呈先降低后增加的趋势.N/P与TP呈极显著负相关,而与TN和C/P呈极显著正相关.可见,人工柠条林在生长过程中土壤养分呈现明显的表聚性,柠条灌丛出现"肥岛效应";由于柠条在生长过程中受到诸多因素的影响,还需加强植被与土壤生态系统N/P化学计量特征,土壤N、P养分限制和植被养分适应特征相互关系的研究.
英文摘要	The thicketization of the shrub has become a common phenomenon in the arid and semi-arid steppe worldwide. The Caragana intermedia has been widely used to prevent grassland degradation because of its low transpiration rate, strong resistance and wide adaptability to the environment. The life activity of C. intermedia was not only restricted by water shortage, but also limited by soil nutrients and environmental stress. This paper revealed the balance and cycle process of soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) in the soil, in which artificial shrub and grass were mixed planting. Therefore, the results can provide basic data for research on the balance and circulation of SOC, TN, TP in the soil of desert grassland ecosystems. The artificial C. intermedia shrubs in different planting-years (9 a, 17 a, 27 a) were taken as research objects, to analyze the contents and the ecological stoichiometry of SOC, TN, TP in the depth of 0-40 cm. The result showed that the SOC and TN contents of the artificial C. intermedia shrubs with different planting-years had significant differences in the vertical section (P<0.01). The contents of SOC and TN in shrubs increased with the planting-years, but decreased with soil depth from 0 to 40 cm, indicating surface accumulation of SOC and TN in the soil. For SOC and TN contents in any part of the shrubs, the order was inside>edge>outside. The contents of TP increased in all the parts of the shrubs with the planting-years, but the soil C/N ratio of each shrub decreased gradually. Furthermore, the soil C/P ratio first decreased and then increased on the edge and the inside of the shrubs, while gradually increased in the outside of the shrubs. The soil N/P ratio in the inside and outside of shrubs both showed increasing trends, and first decreased and then increased in the edge of the shurbs. The soil C/N ratio increased gradually with the increasing soil depth, while the C/P and N/P ratios first decreased and then increased as a whole. The N/P ratio had a significant negative correlation with the TP content (P<0.01), and significant positive correlations with the TN content and the C/P ratio (P<0.01). In conclusion, the soil nutrients in artificial C. intermedia shrubs show a significant surface accumulation and "fertile island" effect. As the growth of C. intermedia shrubs was affected by various factors, further research should be considered on the N/P stoichiometry characteristics of vegetation and soil ecosystem, and the relations between the limiting nutrients of soil N, P and the nutrient adaptability characteristics of vegetation.
中文关键词	荒漠草原 ; 人工柠条灌丛 ; 种植年限 ; 土壤 ; 碳氮磷化学计量特征
英文关键词	desert steppe artificial Caragana intermedia shrubs planting-years soil C, N, P stoichiometry characteristics
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:5400836
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233613
作者单位	宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	潘军,宋乃平,吴旭东,等. 荒漠草原不同种植年限人工柠条林土壤碳氮磷化学计量特征[J]. 宁夏大学,2015,41(2):160-168.
APA	潘军.,宋乃平.,吴旭东.,杨新国.,陈林.,...&翟德苹.(2015).荒漠草原不同种植年限人工柠条林土壤碳氮磷化学计量特征.浙江大学学报. 农业与生命科学版,41(2),160-168.
MLA	潘军,et al."荒漠草原不同种植年限人工柠条林土壤碳氮磷化学计量特征".浙江大学学报. 农业与生命科学版 41.2(2015):160-168.