基于综合旱情指数的橡胶林干旱时空变化及其影响因子分析  

Spatio-Temporal Change and Factor Analysis of Rubber Plantation Drought Based on Drought Index

作　　者：李海亮[1,2] 戴声佩 罗红霞[1] 李世池[3] 

机构地区：[1]中国热带农业科学院科技信息研究所/海南省热带作物信息技术应用研究重点实验室,海南儋州571737 [2]农业部农业遥感重点实验室,北京100081 [3]海南农垦国营阳江农场,海南琼中572928

出　　处：《应用基础与工程科学学报》2017年第6期1114-1123,共10页Journal of Basic Science and Engineering

基　　金：中国热带农业科学院基本科研业务费专项资金(1630072016009)

摘　　要：本文基于HJ-1A/1B-CCD、HJ-1B-IRS数据和地面气象观测数据,以标准化植被供水指数(VSWIS)和综合气象干旱指数(CI)为自变量,以同步实测土壤含水量为因变量,通过多元回归分析构建了橡胶林干旱监测综合模型.经检验,模型具有较高的精度.2010年5月上旬起阳江农场橡胶林旱情持续加重,7月上旬干旱最为严重,7月下旬干旱有所缓解.阳江农场橡胶林干旱空间分异特征较为明显,南轻北重、东轻西重.降水距平对橡胶林干旱存在减缓作用,该作用存在滞后长度约为2旬的滞后现象;平均气温距平对橡胶林干旱存在加重作用,该作用从当旬开始有效.橡胶林旱情较轻期,在海拔91~240m的区域,干旱随海拔的增加而加重,在海拔大于240m的区域,干旱随海拔的增加而减轻;橡胶林旱情较重期,全区域干旱随海拔的增加而加重.同时,干旱存在随坡度增大而加重的趋势.橡胶林平地干旱最轻,干旱在不同坡向上的分异不明显.Using the standardized vegetation supply water index（VSWIS） as interpreted variable,the compound index（CI） and the synchronous soil moisture as independent variables,the rubber plantation drought comprehensive model was established by the method of multiple regression analysis based on HJ-1 A/1 B-CCD data,HJ-1 B-IRS data and meteorological data. Through examining with the observed data,the model performance was satisfactory and reliable. The drought continued to increase from early May which is the start of the monitoring period,and approached maximum in early July.The drought was still serious until late July which is the end of the monitoring period.The drought has spatial stratified heterogeneity.Specifically,the drought is lighter in the east and the south,and heavier in the west and the north. The precipitation anomaly every ten days has negative effects of 20 days lag about on the drought. The mean temperature anomaly every ten days has positive effects on the drought with strong synchronization. During the lighter drought,the drought was aggravated with the elevation increase where range in elevation from 91 to 240 m,and the drought was aggravated with the elevation decrease where the elevation is greater than 240 m.During the heavier drought,regionwide,the drought was aggravated with the elevation increase. The drought was aggravated with the slope increase. The drought in the plain is lighter than in the slope land,and the aspect differentiation of drought is not obvious.

关 键 词：干旱 时空变化 环境减灾卫星 HJ-1A/1B CCD HJ-1B-IRS 橡胶林 海南岛 

分 类 号：S127[农业科学—农业基础科学]