摘要
为了研究荒漠草原区人工柠条(Caragana intermedia)林建植后土壤质地演进过程,构建了10a、17a、27a的林龄序列和柠条灌丛内部、边缘、外部的空间序列,分析了2个序列土壤颗粒组成、黏粉粒富集程度、分形维数以及与其密切相关的土壤有机碳和全氮含量。结果表明:1)土壤质地随着人工柠条林建植年限的增加从灌丛内部、边缘到外部均逐渐得到改善,表现为土层在垂直方向上的"自上而下"和水平方向上以灌丛为中心的"由内到外"的渐进改善过程。柠条灌丛内部的土壤分形维数比外部平均增加0.189±0.401。2)柠条灌丛发育显著增强了退化草原中土壤有机碳和全氮的空间异质性,灌丛内部土壤有机碳和全氮含量比外部分别增加(0.087±0.100)%和(0.008±0.010)%,显示出柠条的"肥岛效应"。土壤有机碳和全氮含量与土壤黏粉粒含量呈极显著正相关(P<0.01)。3)人工柠条林建植对荒漠草原区土壤质地和碳氮资源具有非常明显的协同演进作用。说明柠条林建植对于改善荒漠草原地区的土壤质地及土壤有机碳和全氮含量具有显著作用,但当进入老龄林阶段后土壤质地改善缓慢。
Summary Planting Caragana has achieved remarkable success in the recovery of desertification land in desert steppe because of its excellent biological characteristics , such as tolerance of sand burying , drought‐resistance , and so on . Thus , its sustainability of ecological restoration becomes one of the key topics of concern . Restoration of soil habitat is the foundation for ecosystem being fully restored , and soil texture is the core indicator to evaluate soil properties . In this study , soil texture evolution process and effects after planting C . intermedia stand were investigated to understand its role in desert steppe ecosystem . Series of different stand ages （ 10 a , 17 a , 27 a） and space sequences （ from the inside via the edge to the＆amp;nbsp;outside of shrubs） were designed to analyze the spatiotemporal rules of soil particle composition , increment in silt and clay , volume fractal dimension of soil particles , as well as the contents of soil organic carbon （ SOC） and soil total nitrogen （STN） . The results showed that ：1） The percentages of fine sand （ ranging from 0 .05 mm to 0 .1 mm） were higher than those of silt and clay , coarse sand and gravel sand in the soil particle composition . With the increase of C . intermedia stand ages , soil texture was improved gradually according with vertical orientation of soil depth from top to bottom and horizontal direction from the inside to the outside of shrubs . The volume fractal dimension of soil particles inside shrubs increased by 0 .189 ± 0 .401 on average compared to the outside . 2 ） Spatial heterogeneity of SOC and STN in the surface soil layer changed significantly with the increase of C . intermedia standages.SOCandSTNinsideshrubsincreasedby（0.087±0.100）% and（0.008±0.010）% respectivelyin comparison to those outside shrubs , which indicated the fertility island effect by C . intermedia . The contents of SOC and STN were significantly and positively correlated with the content of silt and clay （ P 〈 0 .01 ） . 3） Caragana intermedia plantation exerted a distinct co‐succession influence on the content of silt and clay and the resource of carbon and nitrogen in desert steppe . In conclusion , soil texture and soil fertility states are significantly improved after the construction of Caragana plantation . However , soil texture is improved more slowly when plantation aged .
出处
《浙江大学学报（农业与生命科学版）》
CAS
CSCD
北大核心
2015年第6期703-711,共9页
Journal of Zhejiang University:Agriculture and Life Sciences
基金
国家自然科学基金(41461046)
国家重点基础研究发展计划前期专项(2012CB723206)
宁夏大学211项目
关键词
人工柠条林
土壤质地
土壤颗粒
分形维数
荒漠草原
宁夏盐池县
artificial Caragana intermedia stand
soil texture
soil particle
fractal dimension
desert steppe
Yanchi County in Ningxia Hui Autonomous Region
