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为研究砒砂岩与沙以不同比例混合复配成土0~30cm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0~30cm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0~30cm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,0~60cm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0~60cm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550nm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 750nm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。
In order to study the difference of soil texture, water storage capacity and related spectral characteristics between 砒 sand and sand mixed with different proportions of compacted soils, the mixing ratio of 砒 sand and sand was set at Fuping, Shaanxi in 2010-2013 to be 1 The four compound soil models with 1: 2 (CK): 1 (C1), 1: 2 (C2), 1: 5 (C3) and loess and sand mixed at a ratio of 1: 2 were measured and analyzed. "Texture, water storage, soil spectra and spectral differences in winter wheat cultivated thereon. The results showed that: (1) With the increase of planting years, the content of sand grains in 0-30 cm soil layer of C1, C2 and C3 compound soil decreased and the content of powder grains increased. The CK treatment reduced the clay grains and increased the sand grains. After three planting seasons, the average contents of grit, silt and clay in the 0-30 cm layer of C2 compound soil were 76.69%, 18.72% and 4.70% respectively. (2) Treatments During the three planting seasons, the water storage in 0 ~ 60cm soil layer was significantly different. With the increase of mixed sand ratio, the water storage capacity first increased and then decreased. In the 0 ~ 60cm soil layer of C2 composite soil, the 3-year average The water storage capacity was 21.34%, 11.59% and 3.91% higher than CK, C1 and C3 compound soil, respectively. (3) In 2013, the reflectance spectra curves of winter wheat at jointing and filling stages were similar (350-2 500), and the canopy reflectance at jointing stage was significantly higher than that at grain filling stage. At about 550 nm in green band Reflection peak. During winter wheat jointing stage, the canopy reflectivity of wheat leaves under C2 treatment was the highest. (4) The spectrum of compound soil after 2013 was the same, the relative reflectance of soil in 350-1 750 nm band increased, and increased with the increase of mixed sand. The spectra of CK, C1, C2 and C3 Reflectance (y) and wavelength (x) showed a good logarithmic relationship with the following equations: y = 0.187ln (x) -0.979, y = 0.159ln (x) -0.801, y = 0.177ln 0.911, y = 0.185ln (x) -0.945. Taking into account the physical properties of the compound soil and its related spectral indexes, C2 treatment is the best proportion of sandstone and sand compounding soil.