干旱区研究 ›› 2023, Vol. 40 ›› Issue (12): 1982-1995.doi: 10.13866/j.azr.2023.12.11

• 植物生态 • 上一篇    下一篇

气候因素和人类活动对砒砂岩区植被净初级生产力的影响

王怡恩1,2(),饶良懿1,2()   

  1. 1.北京林业大学水土保持学院,北京 100083
    2.北京林业大学水土保持国家林业和草原局重点实验室,北京 100083
  • 收稿日期:2023-05-30 修回日期:2023-08-04 出版日期:2023-12-15 发布日期:2023-12-18
  • 通讯作者: 饶良懿. E-mail: raoliangyi@bjfu.edu.cn
  • 作者简介:王怡恩(2001-),女,硕士研究生,研究方向为植被生态遥感. E-mail: en2530111097@163.com
  • 基金资助:
    北京市科技新星计划(2006A22);国家重点研发计划“砒砂岩区复合土壤侵蚀综合治理技术(2017YFC0504503)

Impact of climatic factors and human activities on the net primary productivity of the vegetation in the Pisha sandstone area

WANG Yi’en1,2(),RAO Liangyi1,2()   

  1. 1. College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
    2. Key Laboratory of State Forestry and Grassland Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  • Received:2023-05-30 Revised:2023-08-04 Online:2023-12-15 Published:2023-12-18

摘要:

砒砂岩区是黄土高原水土流失最严重的地区之一,其植被生长状况对该区控制土壤侵蚀和维护生态平衡起着重要作用。本文基于CASA模型和Rclimdex 1.0分别计算了2001—2021年砒砂岩区植被净初级生产力NPP和18个极端气候指数,采用趋势分析、相关分析、随机森林重要性排序、残差分析等研究了砒砂岩区NPP时空变化及其对气候因素的响应特征,并量化了气候因素和人类活动对砒砂岩区NPP的相对贡献。结果表明:(1) 2001—2021年砒砂岩区NPP变化呈显著增加趋势,但未来82.5%的区域NPP将由增加趋势变为减少趋势。(2) 年际尺度上,砒砂岩区NPP与年均气温、年总降水量、极端强降水指数主要呈正相关,与冷夜日数TN10P、气温日较差DTR呈负相关。季节尺度上,春季均温以及暖夜日数增加有利于NPP增加,且存在滞后影响。夏季暖昼日数增加不利于植被生长,且NPP对夏季暖昼日数存在3个月的滞后响应。夏季极端强降水有利于NPP增加,而夏季干旱不利于植被生长,且NPP对持续干燥日数CDD存在3个月的滞后响应。(3) 气候因素和人类活动共同促进了砒砂岩区NPP增加,裸露区和覆沙区气候贡献占主导地位,气候因素相对贡献为62.13%和60.06%,覆土区以人类活动贡献为主导,人类活动贡献率为60.40%。

关键词: 砒砂岩区, 植被净初级生产力(NPP), 极端气候, 人类活动, 残差分析

Abstract:

As a highly serious soil and water loss area in the Loess Plateau, vegetation growth plays an important role in controlling soil erosion and maintaining ecological balance. This study calculated the net primary productivity of vegetation NPP and 18 extreme climate indices in the Pisha sandstone area from 2001 to 2021 based on the CASA model and Rclimdex 1.0, respectively. Trend analysis, correlation analysis, random forest importance ranking, and residual analysis were used to study the spatial-temporal variation of NPP and its response to climate factors in the Pisha sandstone area. The relative contributions of climate factors and human activities to the NPP in the Pisha sandstone area were also calculated. The results showed that (1) NPP variation in all regions of the Pisha sandstone area from 2001 to 2021 had a significant increasing trend, but in the future, 82.5% of the NPP in the Pisha sandstone area will change to a decreasing trend. (2) On the annual scale, NPP correlated positively with average annual temperature, total annual precipitation, and extreme heavy precipitation index and correlated negatively with cold night days TN10P and diurnal temperature range DTR. On the seasonal scale, the increase in average temperature and warm night days in spring was conducive to increase NPP, and there is a lag effect. Increasing the number of warm days in summer was unconducive to vegetation growth, and the NPP has a three-month lag response to the number of warm days in summer. Extreme heavy precipitation in summer was conducive to NPP increase, whereas summer drought was unconducive to vegetation growth, and NPP has a three-month lag response to the number of continuous dry days. (3) Both climate change and human activities contribute positively to NPP in the Pisha sandstone area. The climate contribution of the bare area and the covered sand area is dominant (62.13% and 60.06%, respectively), whereas that of the covered soil area is dominated by human activities (60.40%).

Key words: Pisha sandstone area, net primary productivity of vegetation(NPP), extreme climate, human activities, residual analysis