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	不同沙生灌木下土壤颗粒及重金属空间分布特征
其他题名	Spatial Distribution of Soil Particles and Heavy Metals Under Different Psammophilic Shrubs in the Ulan Buh Desert
	代豫杰 1; 郭建英 2; 董智 1; 李锦荣 2; 李红丽 1
来源期刊	环境科学
ISSN	0250-3301
出版年	2017
卷号	38 期号:11 页码:4809-4818
中文摘要	以乌兰布和沙漠沙冬青、花棒、猫头刺、白刺和梭梭灌木下及流动沙丘0~100 cm风沙土为研究对象,通过野外分层采样与室内实验,采用多重分形理论探讨土壤粒径分布(particle size distribution, PSD)和omega(Mn)、 omega(Zn)、 omega(Cr)、 omega(Cu)、 omega(Pb)、 omega(Ni)、 omega(As)、 omega(Cd)及分布特征并分析其相互关系,反映土壤结构及重金属污染状况.结果表明,alpha(q)-f(q)图像均左偏,呈左钩状,即不同灌木均可增加粒度级配中细小颗粒子集比例,同时,沙冬青、花棒可显著增加PSD范围、非均匀度及离散度.不同灌木下土壤重金属整体表现为omega(Mn)>omega(Zn)>omega(Cr)>omega(Cu)>omega(Pb)>omega(Ni)>omega(As)>omega(Cd),除omega(Cu)及omega(Cr)外,各灌木下0~10 cm土层重金属含量大多高于流动沙丘;沙冬青下omega(Mn)、 omega(Cd)均值分别为354.899、 1.429 mg·kg~(-1),远高于流动沙丘,各土层间差异显著(P<0.05),omega(Mn)、 omega(Cd)最大值分别出现在>30~40 cm、 >10~20 cm土层;花棒下omega(Pb)均值居各灌木之首为13.556 mg·kg~(-1),高于沙冬青3.24%,而omega(As)则低于沙冬青0.37%,但均高于流动沙丘. phi(粉粒)与phi(中砂)分别为决定风沙土中重金属含量的细粒及粗粒土壤,8种重金属均与phi(黏粒)、 phi(粉粒)正相关,除omega(Cr)外,其余重金属均与phi(中砂)负相关,重金属含量与多重分形参数间的相关系数与phi(黏粒)、 phi(粉粒)、 phi(中砂)相似,即多重分形维数同样可较好地描述重金属含量与决定性土壤颗粒间的关系.研究显示,沙冬青及花棒可拦滞风沙流中的细小土壤颗粒使其沉降在周围表层土壤,并更好地改善各土层PSD特征,且二者作用后的风沙土中重金属含量高于其余灌木及流动沙丘,故可通过种植二者局部改良土壤并拦滞、原位固控重金属,减轻下风向城市空气中的重金属污染.
英文摘要	Aeolian sandy soil was collected at depths of 0 to 100 cm at intervals of 0-10, >10-20, >20-30, >30-40, >40-60, >60-80, and >80-100 cm from under the cover of psammophilous shrubs Ammopiptanthus mongolicus, Hedysarum scoparium, Oxytropis aciphylla, Nitraria tangutorum and Haloxylon ammodendron and from a mobile dune in the Ulan Buh Desert. Multi-fractal theory was used to determine the soil particle size distribution (PSD), which measured the fractions of omega(Mn), omega(Zn), omega(Cr), omega(Cu), omega(Pb), omega(Ni), omega(As), and omega(Cd), as well as their distribution status in the laboratory and analyzed correlations between the PSD and heavy metal content to identify the relationship between soil structure and heavy metal pollution. This result shows that a range of different types of shrubs can increase the distribution of fine soil particles, and specifically Ammopiptanthus mongolicus and Hedysarum scoparium can increase range, heterogeneity and degree of dispersion of the PSD. The heavy metal content in the soil under the different shrubs is ranked as omega(Mn)>omega(Zn)>omega(Cr)>omega(Cu)>omega(Pb)>omega(Ni)>omega(As)>omega(Cd). In the first 10 cm of the soil under the shrubs, the concentration of all heavy metals are higher than samples from the mobile dune except for Cr and Cu. Average value of omega(Mn) and omega(Cd) is 354.899 and 1.429 mg·kg~(-1) under Ammopiptanthus mongolicus and Hedysarum scoparium respectively. Concentrations of Mn and Cd under Ammopiptanthus mongolicus and Hedysarum scoparium shrubs are significantly higher than those of mobile dune (P<0.05), and the concentration of both is significantly various between each soil layers (P<0.05). The highest value for omega(Mn) is in soil layer between 30 and 40 cm below the surface and the highest for omega(Cd) appears between 10 and 20 cm below the surface. The average omega(Pb) under Hedysarum scoparium is 13.556 mg·kg~(-1)which is the highest among all the shrubs, exceeding 3.24% under Ammopiptanthus mongolicus and higher than samples from mobile dune. However, average omega(As) under Hedysarum scoparium is exceeded 0.37% under Ammopiptanthus mongolicus but still higher than samples from mobile dune. The grain size of phi(silt) and phi(medium coarse sand) are determining factors for heavy metal concentrations in fine and coarse particles of aeolian sandy soil. Heavy metal measurements all positively correlate with phi(silt) and phi(clay), however, they negatively correlate with phi(medium coarse sand), except for omega(Cr). The correlation coefficients between heavy metal contents and the multifractal parameters are similar for phi(clay), phi(silt), and phi(medium coarse sand). Therefore, multifractal parameters can describe the correlation between heavy metals and their determinant soil grain size. This study shows that, Ammopiptanthus mongolicus and Hedysarum scoparium can entrap and deposit fine particles from the sand flow to surface soil layers around shrubs and improve the condition of PSDs for different soil layers with respect to heavy metals. Hence, in aeolian sandy soil these concentrations are higher than for mobile dunes after planting Ammopiptanthus mongolicus and Hedysarum scoparium. Therefore both should be used to promote good soil structure of particular areas to entrap and in-situ control heavy metals to decrease heavy metal pollution in downwind cities.
中文关键词	沙生灌木 ; 多重分形维数 ; 土壤粒径分布 ; 重金属 ; 乌兰布和沙漠
英文关键词	psammophilous shrubs multifractal theory soil particle size distribution heavy metal Ulan Buh Desert
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:6104797
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236191
作者单位	1.山东农业大学林学院,泰山森林生态站, 山东省土壤侵蚀与生态修复重点实验室, 泰安, 山东 271018, 中国; 2.水利部牧区水利科学研究所, 呼和浩特, 内蒙古 010020, 中国
推荐引用方式 GB/T 7714	代豫杰,郭建英,董智,等. 不同沙生灌木下土壤颗粒及重金属空间分布特征[J],2017,38(11):4809-4818.
APA	代豫杰,郭建英,董智,李锦荣,&李红丽.(2017).不同沙生灌木下土壤颗粒及重金属空间分布特征.环境科学,38(11),4809-4818.
MLA	代豫杰,et al."不同沙生灌木下土壤颗粒及重金属空间分布特征".环境科学 38.11(2017):4809-4818.