滨海盐土区NPP时空分异特征研究——以河北省黄骅市为例

Temporal and Spatial Variation Characteristics of NPP in Coastal Solonchak Area: A Case Study of Huanghua City

随着黄骅地区城市化进程速度的加快,自然植被所产生的生产力下降现象也愈演愈烈。本文以光能利用率模型为基础,对黄骅范围内的植被净初级生产力进行测算,并分析植被净生产力模拟结果的时空分异特征。结论如下:1黄骅市2001~2010年均NPP大部分集中在200~500 g C m^(-2)a^(-1)之间。2黄骅市NPP在2001年到2010年总体呈波动变化,但可以看出有一定上升趋势,在2006年NPP达到顶峰,为512 g C m^(-2)a^(-1),在2002年达到波谷,为202 g C m^(-2)a^(-1)。3研究期间,黄骅市植被NPP分布符合地理分布规律,年均NPP值呈现从西向东递减的变化趋势。从平原农耕地区到盐碱地区,再到东部平原城市地区,NPP呈现下降状态,且存在高值和低值的地域。4不同土地类型间NPP数值也存在差异:其中耕地>盐碱地>水域>湿地>盐田>园地>草地>工矿建设用地。

With the accelerated process of urbanization in Huanghua City, the phenomenon of shrinking natural vegetation and declining productivity is becoming more and more obvious. In this paper, the net primary productivity （NPP） of vegetation in the Huanghua City was calculated based on the light energy utilization model, and the spatial and temporal variation characteristics of the simulated vegetation NPP were analyzed. The results were as follows： 1. Annual average of NPP was about 200 - 500 g C m-2 a-1 in Huanghua City in 2001 - 2010. 2 Annual average of NPP showed fluctuation in Huanghua City in 2001 - 2010. It presented a slight upward trend, reached peak value with 512 g C m-2 a-~ in 2006 and the lowest value of 202 g C m-2 a-~ in 2002. 3 During the study period, the distribution of NPP was accordance with the distribution of geography, and annual average of NPP decreased from west to east of Huanghua City. Total NPP of vegetation decreased gradually from the plain farming area to the saline area, to the plain area of eastern city, which leads to the concentrated spatial distribution of low value and high value. 4. NPP showed difference among various types of land use： cultivated land 〉 saline-alkali land 〉 water area 〉 wetland 〉 salt pan 〉 garden〉 grassland〉 construction land of industry and mining.