摘要
为探究土壤颗粒及土壤生态化学计量学特征对砒砂岩区退耕还林措施的响应,以油松(Pinusta buliformis Carr.)、柠条(Caragana korshinskii Kom.)、小叶杨(Populus simonii Carr.)林地和本氏针茅(Stipa bungeana Trin.)草地为研究对象,以坡耕地为对照,通过野外分层取样与室内试验相结合的方式,运用多重分形理论探究土壤颗粒分布(PSD)、土壤碳(C)、氮(N)、磷(P)含量及化学计量比的分布规律及其相互关系。结果表明:1)不同措施下土壤颗粒均表现出良好的分形特征,退耕还林可以显著增加PSD分布范围、非均匀性和离散程度,并且可以通过提升土壤的优质细粒含量,增加吸附土壤养分的胶结物质,促进土壤C、N、P含量的提升。2)不同措施土壤C、N和P质量分数均值为4.940、0.570和0.056 g/kg,其中C和N元素含量较低,P元素严重匮乏,是本地区的限制元素;土壤C/N、C/P和N/P介于8.02~9.91、77.65~94.34和8.50~11.03之间,不同措施及剖面层次间波动较小。3)黏、粉粒和细砂粒是决定本区域土壤C、N和P元素含量的主要土壤颗粒,能够较好的解释土壤C、N和P元素含量分布特征,奇异谱谱宽(Δα)、容量维数(D0)与土壤C和N含量呈极显著正相关(P<0.01),Δα、奇异谱谱形(Δf)与C、N、P计量比呈极显著正相关(P<0.01)。该研究显示,柠条林对土壤PSD及土壤养分(C、N和P含量)的改良效果最佳,是砒砂岩区生态修复的优良树种,分形参数在表征土壤生态化学计量特征有较好应用的前景。
[Background]Soil and water loss in Pisha sandstone area is serious and the ecological environment in it is very severe.Understanding the spatial distribution characteristics of soil particles and eco-stoichiometric characteristics after Grain for Green project in Pisha sandstone area is of great significance for exploring the mechanism of ecological restoration in this area.[Methods]In order to explore the response of soil particles and soil eco-stoichiometric characteristics to reforestation measures in Pisha sandstone area,we selected Pinus tabuliformis Carr.forest(YS),Caragana korshinskii Kom.forest(NT),Populus simonii Carr.forest(XY)and Stipa bungeana Trin.grassland(ZM)as the research objects,and buckwheat slope farmland(QM)as the control.The soil particle distribution(PSD),soil carbon(C),nitrogen(N),phosphorus(P)and stoichiometric ratio were studied by using multi-fractal theory,and the correlation between them was analyzed.[Results]1)Soil under different measures well reflected multi-fractal character.Grain for Green Project significantly increased the distribution,heterogeneity and dispersion of PSD.It also increased the amount of adsorbed soil nutrients by increasing the content of fine grains,and thus promoted the increase of soil C,N and P content.2)The average contents of C,N and P in soil were 4.940,0.570 and 0.056 g/kg.Among them,the content of C and N was low,and P was seriously deficient and was the limiting element in this area.Soil C/N,C/P and N/P ranged from 8.02 to 9.91,77.65 to 94.34 and 8.50 to 11.03,with little fluctuation among different measures and profiles.3)Clay,silt and fine sand were the main soil particle sizes that determined the content of C,N and P elements in the region.They can better explain the distribution characteristics of C,N and P elements in the soil.Singular index(Δα)and capacity dimension(D0)were positively correlated with soil C and N content(P<0.01).Δαand singular function(Δf)were positively correlated with the measurement ratio of C,N and P(P<0.01).[Conclusions]This study shows that C.korshinskii Kom.forest had the best improvement effect on soil PSD and soil nutrients(C,N,P content),and was an excellent tree species for ecological restoration in Pisha sandstone area.Fractal parameters demonstrate promising application prospects in characterizing soil eco-stoichiometric characteristics.
作者
陈鹏
郭建英
董智
李红丽
张铁钢
仇苏倩
陈小雪
郝瑞芬
CHEN Peng;GUO Jianying;DONG Zhi;LI Hongli;ZHANG Tiegang;QIU Suqian;CHEN Xiaoxue;HAO Ruifen(Taishan Forestry Ecosystem Research Station,College of Forestry,Shandong Agricultural University,271018,Tai′an,Shandong,China;Institute of Water Resources for Pastoral Area of the Ministry of Water Resources of China,010020,Hohhot,China;Water and Soil Conservation Monitoring Station of Dalad Banner,014300,Erdos,Inner Mongolia,China)
出处
《中国水土保持科学》
CSCD
北大核心
2020年第1期25-34,共10页
Science of Soil and Water Conservation
基金
内蒙古自治区科技计划项目“重点水土流失区生态系统综合整治技术集成”(201601062)
国家自然科学基金青年科学基金“风水复合侵蚀区“灌草”斑块格局对侵蚀产沙动力过程的作用机理研究”(41701327)
国家自然科学基金面上基金“放牧强度对典型草原生态水文过程的影响机制”(51879155)。
关键词
砒砂岩区
土壤粒径分布
多重分形
生态化学计量学
退耕还林
Pisha sandstone area
soil particle size distribution
multi-fractal
ecological stoichiometry
Grain for Green Project
