摘要
通过测定不同盐碱化程度土壤上覆植被光谱特征和土壤的盐碱化指标,探讨了通过上覆植被光谱与土壤盐碱化信息的关系。试验结果表明,水稻冠层归一化植被指数(NDVI)从返青期到孕穗期逐渐增大,孕穗期达到最大,然后开始下降;水稻全生育期冠层NDVI与土壤表层全盐、电导率(EC)呈显著相关(相关系数平均分别为0.608 2和0.623 9),孕穗期相关性达到最强;除返青期外,其它时期水稻冠层NDVI与土壤Na++K+呈极显著相关关系(平均相关系数为0.564 8);全生育期水稻冠层NDVI与土壤HCO3-,Cl-,SO24-,Ca2+和Mg2+的相关性很差或不稳定,所以从分蘖期到乳熟期,根据冠层NDVI可以较准确地估测土壤全盐、EC和Na++K+,但不能准确估测土壤中的其它监基离子。
Reflectance characteristics of canopy and salinity parameters of soil were studied to investigate the relationship of reflectance of above-vegetation and salinity information of soil.The results showed that the maximum of canopy NDVI value presented at booting of rice.Throughout the whole growth stages,the canopy NDVI increased with the decrease of the whole salt,EC of surface soil,especially at booting stage.The NDVI of rice canopy was inversely related to soil Na＋＋K＋ at jointing,booting and filling stages,except for the regreening stage.The NDVI of rice canopy did not presented significant differences with the increase of soil HCO-3,Cl-,SO2＋4,Ca2＋ and Mg2＋ at the whole stages.Therefore,the total salt,EC and Na＋＋K＋ of alkali-saline soil could be accurately predicted through measuring the canopy reflectance of rice from tillering to filling stage.
出处
《水土保持通报》
CSCD
北大核心
2011年第6期113-116,120,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"基于土壤与作物光谱特征的龟裂碱土盐碱化信息预测"(41001129)
宁夏回族自治区自然科学基金"基于作物光谱特征的龟裂碱土盐碱化程度反演研究"(NZ0909)
