荒漠-绿洲过渡带不同生境植被生产力格局对降雨的响应

生态学杂志

荒漠-绿洲过渡带不同生境植被生产力格局对降雨的响应

季树新,乔荣荣,白雪莲,王理想,常学礼^*

（鲁东大学资源与环境工程学院，山东烟台 264025）

出版日期:2020-02-10 发布日期:2020-02-10

Response of vegetation productivity patterns to rainfall in different habitats along a desert-oasis transition zone.

JI Shu-xin, QIAO Rong-rong, BAI Xue-lian, WANG Li-xiang, CHANG Xue-li^*

(Department of Resources and Environmental Engineering, Ludong University, Yantai 264025, Shandong, China).

Online:2020-02-10 Published:2020-02-10

摘要/Abstract

摘要： 景观格局分析是理解生态过程发生、发展的重要方法。为了探讨干旱区不同生境植被生产力格局对偶发降雨事件的响应，本研究以荒漠绿洲过渡带砾质荒漠和沙质荒漠生境为对象（样区面积分别为1650 hm²），利用2017年6月22日—6月29日MODIS系列日数据，对一次降雨事件后不同生境生产力格局变化过程进行了分析。结果表明：两种生境景观变化不同，砾质荒漠生境植被生产力（NDVI）未增加面积大于沙质荒漠生境，砾质荒漠生境的植被生产力变化主要集中在0～0.01，景观面积波动范围为612.5～1200 hm²；沙质荒漠生境植被生产力增加范围集中在大于0.01，景观面积波动范围为150～1587.5 hm²；在干旱区降雨事件发生后，随时间推移砾质荒漠生境景观趋于破碎化，沙质荒漠生境景观中简单斑块成为景观格局主体。

关键词: 低温, 生物结皮, 呼吸作用, 模拟增温

Abstract: Landscape pattern analysis is an important method to understand the occurrence and development of ecological processes. In this study, we investigated the responses of vegetative productivity patterns of a gravel desert and a sandy desert (with a size of 1650 hm² each) in the desertoasis transition zone to sporadic rainfall events by using the MODIS data from June 22 to June 29, 2017. The internal landscape changes of these two habitats were different from each other. The area without increase of vegetation productivity (NDVI) in the gravel desert habitat was larger than that in sandy desert habitat. The change of vegetation productivity mainly occurred in the range of 0-0.01 in the gravel desert habitat, with its fluctuation area between 612.5 and 1200 hm². For the sandy desert habitat, the increase of vegetation productivity was concentrated above 0.01, and the fluctuation area ranged from 150 to 1587.5 hm². The landscape of the gravel desert habitat tended to be fragmented over time after rainfall events in the arid area, while the pattern of simple patches dominated the sandy desert habitat landscape.

Key words: biocrusts, low temperature, simulated warming., respiration

季树新,乔荣荣,白雪莲,王理想,常学礼. 荒漠-绿洲过渡带不同生境植被生产力格局对降雨的响应[J]. 生态学杂志.

JI Shu-xin, QIAO Rong-rong, BAI Xue-lian, WANG Li-xiang, CHANG Xue-li. Response of vegetation productivity patterns to rainfall in different habitats along a desert-oasis transition zone.[J]. cje.

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