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作者	单位
李娟，韩霁昌，张卫华，王欢元	（1.陕西省土地工程建设集团有限责任公司，陕西西安 710075； 2.西北农林科技大学林学院，陕西杨凌 710021；3.国土资源部退化及未利用土地工程整治研究中心，陕西西安 710075）

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中文摘要:

为研究砒砂岩与沙以不同比例混合复配成土0~30 cm土层土壤质地、贮水量及相关光谱特性的差异，于2010-2013年在陕西富平设置了砒砂岩与沙混合比例分别为1∶1(C1)、1∶2(C2)、1∶5(C3)和黄土与沙混合比例为1∶2(CK)的4种复配土模式，测定和分析了复配“土壤”的质地、贮水量、土壤光谱和在其上栽培的冬小麦光谱差异。结果表明，（1）随着种植年限的增加，C1、C2和C3复配土壤0~30 cm土层均呈现砂粒含量减少、粉粒含量增加趋势；CK处理则粘粒减少、砂粒增加。三个种植季后，C2复配土0~30 cm土层中的砂粒、粉粒和粘粒平均含量分别为76.69%、18.72%和4.70%。（2）各处理在三个种植季间，0~60 cm土层贮水量差异明显，随着混合沙比例的增加呈先增加后减少趋势，C2复配土0~60 cm土层中，3年平均贮水量较CK、C1和C3复配土分别高21.34%、11.59%和3.91%。（3）2013年，各处理冬小麦在拔节期和灌浆期的全波段（350~2 500）反射光谱曲线特征相似，且拔节期冠层反射率明显高于灌浆期；在绿光波段550 nm左右形成反射峰；在冬小麦拔节期，C2处理下小麦叶片冠层反射率最高。（4）2013年小麦收获后各复配土光谱曲线特征一致，在350~1 750 nm波段土壤相对反射率呈增加趋势，且随混合沙的比例增加而增加；CK、C1、C2 和C3的光谱反射率（y）与波长（x）呈现良好的对数关系，其方程分别为：y=0.187ln(x)－0.979，y=0.159ln(x)－0.801，y=0.177ln(x)－0.911，y=0.185ln(x)－0.945。综合考虑各复配土的物理性状及其相关光谱指标，C2处理是砒砂岩与沙复配成土的最佳比例。

英文摘要:

To study the soil texture,water storage and related spectral characteristics of composited soil,we designed the composited soils using feldspathic sandstone and sand by 3 different ratios,1∶1(C1),1∶2(C2) and 1∶5(C3),and the CK used loess soil and sand by 1∶2,then measured and analyzed the soil texture,water storage,soil and winter wheat spectral characteristic under those treatments in 2010-2013.The results indicated that:(1) With the increasing of the planting year,treatement C1,C2 and C3 all showed decreasing in the proportions of sand and increasing of silt and the CK showed decreasing of clay and increasing of sand,along 0-30 cm soil depth.Treatment C2 showed the proportion of sand,silt and clay were 76.69%,18.72% and 4.70%,respectively.(2) The water contents of all the treatments were significant different from each other in 0-60 cm soil depth ,and showed increasing trend with the increasing of sand proportion.Treatment C2 had higher average water content during the 3 years than treatment CK,C1 and C3 by 21.34%,11.59% and 3.91% in the same soil depth,respectively.(3) In 2013,the spectral reflection curve characters were similar for all treatment of winter wheat at the jointing stage and filling stage along the full wave band(350-2 500 nm),and the reflectance was higher in the jointing stage than the filling stage; the reflection peak was found around 550 nm,a part of green light wave band.Treatment C2 showed the highest canopy reflectance at the jointing stage.(4)By measuring the soil spectral characteristics in 2013,we found that all treatments had similar spectral curves,and the relative reflectance of soil increased during 350-1 750 nm wave length along with the increase of the sand proportion; for treatment CK,C1,C2 and C3,the soil spectral reflectance(y) and wave length (x) appeared highly correlated relationships,they were y=0.1871ln(x)－0.9794,y=0.1587ln(x)－0.8012,y=0.1771ln(x) －0.9108 and y=0.1845ln(x)－0.9445,respectively.Synthesizing the soil physical properties and related spectral character indices,treatment C2 generated the best combination ratio of feldspathic sandstone and sand.

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