西北干旱区植被净初级生产力年际变化及其时空和气候因子的贡献——以河西走廊为例

doi:10.13292/j.1000-4890.202010.034

生态学杂志 ›› 2020, Vol. 39 ›› Issue (10): 3265-3275.doi: 10.13292/j.1000-4890.202010.034

西北干旱区植被净初级生产力年际变化及其时空和气候因子的贡献——以河西走廊为例

李传华^*,周敏,王玉涛,朱同斌,孙皓,殷欢欢,曹红娟,韩海燕

（西北师范大学地理与环境科学学院，兰州 730070）

出版日期:2020-10-10 发布日期:2021-04-09

Inter-annual variation of vegetation net primary productivity and the contribution of spatialtemporal and climate factors in arid Northwest China: A case study of Hexi Corridor.

LI Chuan-hua^*, ZHOU Min, WANG Yu-tao, ZHU Tong-bin, SUN Hao, YIN Huan-huan, CAO Hong-juan, HAN Hai-yan

(College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, Gansu, China).

Online:2020-10-10 Published:2021-04-09

摘要/Abstract

摘要： 干旱半干旱区主导着全球植被净初级生产力（net primary productivity，NPP）的年际变化（inter-annual variability，IAV），但该区域NPP-IAV及其驱动机制并不清楚。本文以河西走廊为研究区，使用CASA模型估算2002—2017年的NPP，基于距平通量公式计算了该地区NPP-IAV，并定量估算了时间、空间以及气候因子对NPP-IAV的贡献。结果表明：2002—2017年河西走廊NPP呈上升趋势，植被生长状况良好；NPP-IAV呈现先负后正的变化规律；河西走廊NPP-IAV受暖干和冷湿气候影响，前者控制的面积最大（51.01%），但对NPP-IAV的贡献仅占15.38%；后者对NPP-IAV的贡献率最大（48.68%），但面积仅占23.67%；暖干气候主导着河西走廊NPP的分布格局，冷湿气候主导着NPP年际变化；7月NPP对IAV贡献最大，3月最小；草地主导着河西走廊NPP-IAV；荒漠NPP总量最低，但贡献率却高于森林。据此预测，随着中国西北干旱区气候变暖，该地区植被NPP-IAV将进一步加剧。

关键词: 净初级生产力, 年际变化, 时空贡献, 气候驱动, 河西走廊

Abstract: Net primary productivity (NPP) in arid and semi-arid areas dominates the inter-annual variation (IAV) of global NPP. However, the NPP-IAV and its driving mechanisms in these areas remain unknown. Here, we estimated NPP in Hexi Corridor during 2002-2017 using the CASA model, calculated the change of NPP-IAV based on the formula of anomaly flux, and quantitatively estimated the contributions of spatial-temporal and climate factors to NPP-IAV. The results showed that NPP in Hexi Corridor increased from 2002 to 2017, and vegetation was growing well. During the study period, NPPIAV showed a variation pattern from negative to positive. The NPP-IAV of Hexi Corridor was affected by warm-dry and cold-wet climate. The former climate condition controlled the largest area (51.01%) and contributed only 15.38% to NPP-IAV. In contrast, the cold-wet condition contributed the most to NPP-IAV (48.68%), though only accounted for 23.67% of the area. The warm-dry climate dominated the distribution pattern of NPP in the Hexi Corridor, with the coldwet climate dominating the NPPIAV. NPP in July contributed the most and that in March contributed the least to IAV. Grasslands dominated the NPP-IAV in the Hexi Corridor. The total NPP in desert was the lowest, but its contribution to NPP-IAV was more than that of forests. Therefore, it is predicted that the vegetation NPP-IAV will be further intensified with climate warming in the arid region of northwest China in the future.

Key words: net primary productivity, inter-annual variation, spatial-temporal contribution, climate driving, Hexi Corridor.

李传华, 周敏, 王玉涛, 朱同斌, 孙皓, 殷欢欢, 曹红娟, 韩海燕. 西北干旱区植被净初级生产力年际变化及其时空和气候因子的贡献——以河西走廊为例[J]. 生态学杂志, 2020, 39(10): 3265-3275.

LI Chuan-hua, ZHOU Min, WANG Yu-tao, ZHU Tong-bin, SUN Hao, YIN Huan-huan, CAO Hong-juan, HAN Hai-yan. Inter-annual variation of vegetation net primary productivity and the contribution of spatialtemporal and climate factors in arid Northwest China: A case study of Hexi Corridor.[J]. Chinese Journal of Ecology, 2020, 39(10): 3265-3275.

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西北干旱区植被净初级生产力年际变化及其时空和气候因子的贡献——以河西走廊为例

Inter-annual variation of vegetation net primary productivity and the contribution of spatialtemporal and climate factors in arid Northwest China: A case study of Hexi Corridor.

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