氮肥水平对多花黑麦草叶绿素及高光谱反射特征的影响  

Chlorophyll Content and Reflectance Response of Annual Ryegrass to Nitrogen Fertilization Level

作　　者：杨红丽[1] 陈功[1] 吴建付[1] 

机构地区：[1]云南农业大学动物科学技术学院,云南昆明650201

出　　处：《云南农业大学学报（自然科学版）》2009年第4期534-538,共5页Journal of Yunnan Agricultural University:Natural Science

基　　金：云南省自然科学基金项目(2004C0038M)

摘　　要：叶绿素含量是评价牧草群体长势、估测产量和确定最佳施肥量的重要指标。对不同氮肥水平下多花黑麦草(特高)叶绿素含量及冠层反射光谱特征进行了测试与分析,并研究了高光谱参数红边位置与叶绿素含量的相关性。结果表明:在分蘖期和拔节期施用氮肥(尿素)达到300 kg/hm2时,能够显著提高多花黑麦草叶绿素含量;显著降低可见光和近红外区域冠层光谱反射率;并且使红边位置(λr)向长波方向移动。多花黑麦草冠层叶绿素a,叶绿素b,叶绿素a+b与红边位置之间均存在极显著相关性(P<0.01)。利用高光谱参数红边位置可以更加快速、准确地对多花黑麦草冠层叶绿素含量进行估测并筛选适宜施肥量。From April to July in 2007, annual ryegrass cv. Tetragold, which is one of the most widely planted cuhivars, was used and tested the response of chlorophyll content and swards reflectance to different levels of nitrogen fertilization. The results from the current experiment showed that nitrogen fertilization level （urea） of 300 kg/hm2 during tillering and jointing period significantly increased the chlorophyll a, chlorophyll b and chlorophyll a ＋ b, significantly decreased the reflectance at both visual and near-infrared bands while the red-edge position shifted to longer wavelengths. There were significant relationships between red-edge position and chlorophyll a, chlorophyll b and chlorophyll a ＋ b. It is suggested that hyperspectral parameters, especially red-edge position, could be used for monitoring annual ryegrass swards chlorophyll content as well as choosing the optimum nitrogen fertilization level more quickly than traditional methods.

关 键 词：多花黑麦草特高 红边位置 叶绿素 反射光谱 

分 类 号：S543.601[农业科学—作物学]