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论文以库布齐沙漠沙柳沙障固沙地迎风坡不同部位沙粒、黑色及绿色生物结皮为研究对象,通过实地采集地物光谱数据,对比分析了其在迎风坡不同部位的光谱反射特性及变化规律。研究结果表明:土壤颗粒的大小直接关系到土壤反射率高低,随着人工固定沙地地表土壤中粉粒和黏粒含量的增加,其地表反射率呈下降的趋势;黑色生物结皮的光谱反射率曲线总体变化比较平缓,与维管植物相比差异较大,反映到光谱曲线上典型特点是“红边”位置基本不存在;绿色结皮的光谱特性从绿光波段反射峰、叶绿素吸收峰及高反射区等方面与维管植物比较相近,最典型的特点是“红边”不仅存在而且非常明显,说明绿色生物结皮比黑色生物结皮更接近维管植物的特点。
In this paper, the sand grains, black and green crusts in different parts of the sandy slope of Salix Sandy in the Kubuqi desert are studied. Spectral reflectance data of different parts of the windward slope are comparatively analyzed by field data acquisition And changes in the law. The results show that: the size of soil particles is directly related to the level of soil reflectance, and with the increase of the content of silt and clay in surface soil of fixed sandland, the surface reflectance tends to decrease; the spectral reflectance of black biological crust The overall curve of the rate curve is relatively flat, which is quite different from that of the vascular plants. It is reflected that the typical feature on the spectral curve is that there is almost no position at the “red edge” position. The spectral characteristics of the green crust are changed from green band reflection peak, chlorophyll Absorption peak and high reflection area are similar to vascular plants. The most typical characteristic is that “red edge” is not only existed but also very obvious, indicating that the green biological crust is closer to the vascular plant than the black biological crust.