库布齐沙漠东缘荒漠藻生物结皮光谱特性研究.docVIP

 库布齐沙漠东缘荒漠藻生物结皮光谱特性 研究# 5 10 15 20  摘要：根据测定研究区各种地物的光谱数据，分析了内蒙古林科院达拉特旗沙漠综合科学研 究站不同年份接种的荒漠藻黑色、绿色结皮及裸沙、沙打旺、油蒿、沙柳的光谱特性及其变 化规律。研究结果表明：三种植物光谱曲线与健康植被光谱曲线相近，“红边”位置明显，荒 漠藻黑色、绿色结皮及裸沙的光谱反射率变化比较平缓；荒漠藻绿色结皮表现出绿色植物所 具有的光谱曲线变化特点；荒漠藻黑色与绿色结皮光谱反射率相比，总的变化趋势为：350～ 710nm 之间，黑色结皮光谱反射率较绿色结皮高，710～1350nm 之间，黑色比绿色结皮的光 谱反射率低。 关键词：光谱特性；荒漠藻；人工生物结皮；库布齐沙漠 中图分类号：O433.1 Study on the Spectral Characteristics of Desert Algae Artificial Biological Crust in the East Edge of Kubuqi Desert YANG Guang1, LI Qinghe2 (1. College of Ecology and Environmental Science,Inner Mongolia Agricultural University, Hohhot 010019; 2. Inner Mongolia Water Supervision Center, Hohhot 010020) Abstract: According to the spectral data of the various objects measured in the study area, analyzed the spectral characteristics and it’s variation rules of black and green desert algae 25 30 35 40 crust ,bare sand ,adsurgens ,oil Artemisia, Salix inoculated in different years in Inner Mongolia Academy of Forestry Dalateqi Desert Research Station. The results showed that the spectral curves of three kinds of plants are similar to the spectral curve of healthy vegetation. red edge position is obvious, the spectral reflectance changes of black and green desert algae crust and bare sand are relatively gentle; The spectral characteristics of green desert algae crust are similar to green plants; The trend of spectral reflectance changes compared between black and green desert algae crust is that black crust is higher than green crust between 350 to 710nm, and lower than it between 710 ~ 1350nm. Keywords: the Spectral Characteristics; Desert Algae; Artificial Biological Crust; Kubuqi Desert 0 引言 荒漠地表生物结皮是由土壤微生物、藻类、地衣和苔藓等孢子植物类群与土壤形成的有 机复合体，它的形成使土壤表面在物理、化学和生物学特性上均明显不同于松散沙土，具有 较强的抗风蚀、水蚀功能，也是干旱荒漠区植被演替的重要基础[1-3]。20 世纪 80 年代以来， 伴随着沙漠化威胁的日益加重，生物结皮在荒漠生态系统中的作用愈发突出，生物结皮所具 有的生态功能亦引起了学者的普遍重视，并逐渐成为荒漠地区生态研究的热点。研究者分别 从地表生物结皮的发育及生物结皮对土壤入渗、植物生长、土壤抗冲性、土壤微生物的影响 等方面进行了研究与探讨[4-11]，而对荒漠地表生物结皮的光谱特性研究较少。本文以库布齐 沙漠东缘荒漠藻人工生物结皮为研究对象，对不同年份接种的黑色与绿色藻结皮进行地物光 -1