干旱区生态环境知识资源中心(Arid): 宁夏东部荒漠草原灌丛引入过程中土壤有机碳变化及其空间格局预测

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	宁夏东部荒漠草原灌丛引入过程中土壤有机碳变化及其空间格局预测
其他题名	Soil organic carbon dynamics and the prediction of their spatial changes in response to anthropogenically introduced shrub encroachment in desert steppe of the Eastern Ningxia, China
	赵亚楠 1; 杜艳艳 1; 马彦平 1; 赵延兵 1; 周玉蓉 1; 王红梅 2
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2019
卷号	30 期号:6 页码:1927-1935
中文摘要	以宁夏荒漠草原封育草地、放牧地为对照,对不同年限(3、12、22年)和间距(2、8、40 m)柠条地开展灌丛引入对土壤有机碳(SOC)的影响研究,并模拟预测该地区人工灌丛引入过程中0~40 cm土层SOC空间特征及格局.结果表明: SOC含量随着柠条灌丛引入年限增加和间距的减小而呈增加趋势,各年限和间距柠条灌丛地SOC均值分别比放牧地高42.7%和32.8%,且均与封育草地无显著差异,但SOC的增加趋势在灌丛引入22年出现降低,降幅为27.0%.SOC空间异质性表明,研究区内人工灌丛引入后0 ~ 40 cm土层SOC含量为0.21 ~ 26.04 g·kg~(-1),均值为3.75 g·kg~(-1),变异系数为90.9%~ 114.7%; 0 ~ 5、15 ~ 40 cm土层符合高斯模型,5~15 cm土层符合球状模型; 0~5、5~15 cm土层变程均小于15 ~ 40 cm土层,三者分别为3.11、3.00和10.10 km.0~5、5~15 cm土层SOC的块金系数C_0/(C_0+C)为0.2%~16.3%,具有强烈的空间相关性; 15~40 cm土层的块金系数为36.9%,为中等程度相关.人工灌丛引入过程中加速了退化荒漠草地0~40 cm土层SOC的累积与固定,同时加剧了土壤表层SOC空间异质性、破碎化,且与封育14年荒漠草地SOC含量无显著差异,其空间异质性、破碎化程度随土层深度增加均呈减弱趋势.
英文摘要	With the 14-year enclosed grassland and the grazed grassland as control,the impacts of anthropogenic shrublands (Caragana korshinskii) with the different planting years (3,12,22 a) and planting spaces (2,8,40 m) on soil organic carbon (SOC) contents were examined in the desert steppe of Eastern Ningxia,China. We further analyzed the spatial pattern and heterogeneity of SOC in 0-40 cm soil layer of the grassland area with introduced shrubs. The results showed that SOC in C. korshinskii shrublands had an increase trend with increased planting years and decreased spaces. The mean SOC with different planting years and spaces was 42.7% and 32.8% more than that in grazing land,respectively. There was no significant difference of SOC between shrublands and the 14-year enclosed grassland. The increase trend of SOC decreased by 27.0% in 22-year planting shrubland. The SOC content of 0 - 40 cm soil layer varied from 0.21 g·kg~(-1) to 26.04 g·kg~(-1) (with a mean of 3.75 g·kg~(-1)),and the coefficient of SOC variation ranged from 90.9% to 114.7%. The SOC in 0-5 cm and 15-40 cm soil layers fitted the optimal theory formulation of Gaussian model,while that in 5-15 cm soil layer fitted a spherical model. The ranges (A0) of spatial autocorrelation in the 0-5 and 5-15 cm soil layers were smaller (3.11,3.00 km) than that in 15-40 cm soil layer (10.10 km). The nugget/sill C_0/(C_0+C) of SOC in 0-5,5-15 cm soil layer was 0.2% and 16.3%,indicating a strong spatial correlation,while that in 15-40 cm soil layer was 36.9%,with a moderate correlation. The shrub introdution could significantly accelerate the accumulation and fixation of SOC in top 40 cm soil layer in degraded desert steppe,but also intensified the spatial heterogeneity and SOC fragmentation. The SOC content in the anthropogenic shrublands had no significant difference from that in the enclosed desert steppe (14 years). The SOC spatial heterogeneity and the degree of fragmentation were weakened and decreased with the increasing soil layer depth.
中文关键词	荒漠草原 ; 人工灌丛 ; 土壤有机碳 ; 空间预测 ; 灌丛化
英文关键词	desert grassland anthropogenically introduced shrub soil organic carbon spatial prediction shrub encroachment
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:6509398
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/2XILL650/239674
作者单位	1.宁夏大学农学院, 银川, 宁夏 750021, 中国; 2.宁夏大学农学院;;西北退化生态系统恢复与重建教育部重点实验室, ;;西北退化生态系统恢复与重建教育部重点实验室, 银川;;银川, ;; 750021;;750021
推荐引用方式 GB/T 7714	赵亚楠,杜艳艳,马彦平,等. 宁夏东部荒漠草原灌丛引入过程中土壤有机碳变化及其空间格局预测[J]. 宁夏大学,2019,30(6):1927-1935.
APA	赵亚楠,杜艳艳,马彦平,赵延兵,周玉蓉,&王红梅.(2019).宁夏东部荒漠草原灌丛引入过程中土壤有机碳变化及其空间格局预测.应用生态学报,30(6),1927-1935.
MLA	赵亚楠,et al."宁夏东部荒漠草原灌丛引入过程中土壤有机碳变化及其空间格局预测".应用生态学报 30.6(2019):1927-1935.