地表温度在监测湖区钉螺孳生地中的作用

Abstract

目的 通过比较钉螺孳生地和无钉螺孳生区域的地表温度(LST),探讨LST在监测钉螺孳生地中的作用.方法选择江西省退田还湖区和赣江堤内洲滩,按有螺、无螺分为4个试区,从遥感图片中提取植被指数(NDVI)和LST,比较二者在钉螺孳生区和无钉螺孳生区的差别,从而说明LST在判别湖区钉螺孳生地中的作用.结果东风圩(退田还湖区)的NDVI主要在0～0.20范围,2个有螺区域的NDVI主要在0.20～0.40之间.4个试区的NDVI差异有统计学意义(x2=104.69,P＜0.01).东风圩LST是24～30℃,五洲头-无螺区的LST主要在23～28℃范围,五洲头-有螺区取值在22～26℃,长江洲的LST较低,其值主要位于20～24℃之间.4个试区的LST值总体分布不同(x2=115.23,P＜0.01).进-步两两比较分析发现,无螺区的NDVI低于有螺试区,而LST较高.结论钉螺孳生地和非钉螺孳生地的NDVI和(或)LST差异存在统计学意义,LST对某区域是否适宜钉螺孳生有一定的指示作用。

OBJECTIVE: To discuss the land surface temperature's effect on supervising the areas with snails, comparing the land surface temperature (LST) of the areas with snails with the LST of those without snails. METHODS: Choosing the lake areas of farmland in Jiangxi Province and the beach in the bank of Ganjiang, dividing into four areas according to snails. Picking up the normalized difference vegetation index (NDVI) and LST from the remote sensing data to find the difference between the areas with snails and the areas without snails, so as to illuminate the effects of the LST on distinguishing the areas with snails. RESULTS: The NDVI of Dongfeng Wei (an area from farmland to lake) was 0 - 0.20, the NDVI of the areas with snails was 0.20 - 0.40. The NDVI of four areas is different (chi(2) = 104.69, P < 0.01). The LST of Dongfeng wei was 24 - 30 degrees C, Wuzhoutou without snails is 23 - 28 degrees C, Wuzhoutou with snails is 22 - 26 degrees C, Changjiangzhou was 20 - 24 degrees C. The LST of four areas is different (chi(2) = 115.23, P < 0.01). The analysis farther indicates the NDVI of areas without snails was lower than that of areas with snails, but the LST was higher. CONCLUSION: The NDVI and (or) the LST should be significantly different between the areas with snails and the areas without, it might be concluded that the LST should be a indication to some extent on judging whether some areas may be fit for snails.