Wang Yao Bin, Zhao Yong Hua, Han Lei, Ao Yong
College of Earth Sciences and Resources/College of Land Engineering, Chang'an University, Xi'an 710054, China.
Ying Yong Sheng Tai Xue Bao. 2018 Jul;29(7):2373-2381. doi: 10.13287/j.1001-9332.201807.010.
We analyzed spatiotemporal changes in vegetation net primary productivity (NPP) in the Qinling-Daba Mountains based on MOD17A3 data and driving factor data from 2000 to 2015. We used trend analysis, Hurst index, and correlation analysis to examine the effects of climate change, soil type, topographic factors, vegetation type, and human activities on NPP. With respect to spatial variation, NPP was the highest in southwestern area and lowest in the northeast. The temporal trend over the 16-year period showed that NPP was increased in the northwest and decreased in the northeast. The projected trend of NPP was of continuity in northern area and anti-continuity in southern area of the Qinling-Daba Mountains. NPP was positively correlated with precipitation and temperature. NPP in areas with dark-brown earths, yellow earths, purplish soils and paddy soils were significantly higher than those with other soil types. The spatial distribution and trends of NPP differed among vegetation types. High NPP mainly occurred on slopes of 25° to 50° and altitudes of 500 to 1000 m or above 2500 m. Human activities had both positive and suppressive effects on NPP.
基于MOD17A3数据和2000年至2015年的驱动因子数据，我们分析了秦岭 - 大巴山植被净初级生产力（NPP）的时空变化。我们采用趋势分析、赫斯特指数和相关性分析，研究气候变化、土壤类型、地形因素、植被类型和人类活动对NPP的影响。在空间变化方面，NPP在西南地区最高，在东北地区最低。16年期间的时间趋势表明，NPP在西北地区增加，在东北地区减少。秦岭 - 大巴山北部地区NPP的预测趋势具有连续性，南部地区则具有反连续性。NPP与降水和温度呈正相关。暗棕壤、黄壤、紫色土和水稻土地区的NPP显著高于其他土壤类型地区。NPP的空间分布和趋势在不同植被类型间存在差异。高NPP主要出现在25°至50°的坡度以及500至1000米或2500米以上的海拔高度。人类活动对NPP既有积极影响，也有抑制作用。
