2006—2015年秦巴山区植被光合有效辐射吸收比例的时空变化特征

生态学杂志

2006—2015年秦巴山区植被光合有效辐射吸收比例的时空变化特征

章金城,周文佐^*

（西南大学地理科学学院，重庆 400715）

出版日期:2019-05-10 发布日期:2019-05-10

Spatial-temporal changes of fraction of absorbed photosynthetically active radiation in Qinling-Daba Mountains from 2006 to 2015.

ZHANG Jin-cheng, ZHOU Wen-zuo^*

(School of Geographical Sciences, Southwest University, Chongqing, 400715, China).

Online:2019-05-10 Published:2019-05-10

摘要/Abstract

摘要： 光合有效辐射吸收比例（fraction of absorbed photosynthetically active radiation, FPAR）反映了植被吸收光合有效辐射的能力，是许多陆面模型的重要输入参数。本文旨在研究中国重要的南北气候分界带秦巴山区植被FPAR的时空变化特征。基于2006—2015年MODIS遥感数据及气象数据，采用趋势分析法对秦巴山区植被FPAR像元尺度的时空变化特征进行了分析，并利用相关分析法探讨了植被FPAR变化对气候变化的响应。结果表明：秦巴山区植被FPAR空间差异明显，呈西北和东北低、中部和东南部高的分布特征，并且随海拔的升高而降低，具有明显的垂直地带性；2006—2015年秦巴山区植被FPAR空间变化表现为中部增加、四周减少的空间格局，显著增加的区域主要分布在嘉陵江、丹江流域及汉江下游地区，甘南高原及川西高原等地呈不显著减少趋势；近10年秦巴山区植被FPAR呈显著增加趋势，增速为4.8%·10 a^-1（P<0.05），以作物FPAR增加趋势最为明显（P<0.05），并且植被FPAR在冬季上升显著（P<0.05）；从年际水平看，秦巴山区植被FPAR变化总体上与气温的关系比降水量更加密切，但存在植被类型差异：针叶林、阔叶林FPAR与年平均气温相关性更高，草地、作物FPAR受年降水量影响更大。

关键词: 生物过滤-蔬菜浮床组合系统, 蔬菜浮床系统, 温室甲鱼养殖废水, 脱氮除磷效能

Abstract: Fraction of absorbed photosynthetically active radiation (FPAR), the part of photosynthetically active radiation that is absorbed by vegetation, is one of the important parameters in terrestrial ecosystem simulating models. The purpose of this study was to clarify spatial-temporal changes of the FPAR in Qinling-Daba Mountains where is on the important north-south climate transitional zone in China. Based on the MODIS remote sensing data and climate datasets from 2006 to 2015, a linear regression analysis was used to examine spatial-temporal changes of FPAR at pixel scale in Qinling-Daba Mountains. A correlation analysis was conducted to analyze the relationship between vegetation FPAR and climate factors. The results showed that there was spatial difference in FPAR distribution in the Qinling-Daba Mountains, with high FPAR values in the center and southeast and lower values in the northwest and northeast of study area. They decreased with altitude, with obvious vertical zonality along mountains. From 2006 to 2015, the FPAR increased in the central region and decreased in the surrounding area. The areas with significantly increased FPAR values were mainly distributed in the basins of Jialing River and Danjiang River and the downstream of Hanjiang River. The FPAR values slightly decreased in parts of the Gannan Plateau and the Western Sichuan Plateau. During last decade, the FPAR of vegetation, on the whole, appeared a significantly increasing trend with a rate of 4.8%·10 a^-1 (P<0.05) and the most outstanding vegetation was crop (P<0.05). Among the four seasons, the FPAR significantly increased in winter (P<0.05). Annually, the correlation between vegetation FPAR and climate factors showed that vegetation FPAR was more correlated with mean annual temperature than that with mean annual precipitation on all vegetation types. However, the correlations differed among vegetation types. Coniferous forest and broad-leaved forest FPAR had higher correlations with mean annual temperature than other types, while grasslands and croplands were influenced much more by mean annual precipitation than by mean annual temperature.

Key words: biological filtrationvegetable floatingbed combined system, vegetable floating-bed system, greenhouse turtle breeding wastewater, nitrogen and phosphorus removal.

章金城,周文佐. 2006—2015年秦巴山区植被光合有效辐射吸收比例的时空变化特征[J]. 生态学杂志.

ZHANG Jin-cheng, ZHOU Wen-zuo. Spatial-temporal changes of fraction of absorbed photosynthetically active radiation in Qinling-Daba Mountains from 2006 to 2015.[J]. cje.