Dissertation > Excellent graduate degree dissertation topics show

Estimation of Net Primary Productivity in Qinghai Province with LUE Model

Author: ZhaoGuoShuai
Tutor: FanWenYi；WangJunBang
School: Northeast Forestry University
Course: Forest Management
Keywords: Net primary productivity (NPP) NPP-EMSC model Photosynthetically active radiation (PAR) Remote sensing Qinghai
CLC: Q948
Type: Master's thesis
Year: 2011
Downloads: 152
Quote: 1
Read: Download Dissertation

Abstract

Terrestrial ecosystem carbon cycle is the most important part of the global carbon cycle research, but also the core scientific issues of global change scientific research plays an important role in the global carbon budget studies. Simulation of net primary productivity of terrestrial ecosystems, the primary productivity of the study area, and even global scale, to estimate the carbon flux spatial distribution of information as well as an important means to predict changes in the ecological environment is one of the most important aspects of the carbon cycle, and is directly related to vegetation fixed atmospheric CO2, and further affect other aspects of the carbon cycle. In this paper, based on the theory of light use efficiency, and build a regional scale terrestrial ecosystem net primary productivity model (NPP.EMSC), to analysis of the spatial and temporal patterns of net primary productivity of terrestrial ecosystem of the Qinghai region from the point of view of resource balancing. Every 8 days using interpolated meteorological data from remote sensing data (MODIS and HJ-1B), high resolution DEM data, simulated net primary productivity of terrestrial ecosystem of the Qinghai region in 2008 and 2009. The simulation results show that: The Qinghai region total NPP in 2009 was 58.23 Tg C, an average of 92 g C · m-2 · a-(?) NPP overall distribution trend showed a decreasing trend from southeast to northwest. Qinghai region east and southeast of the forest ecosystem NPP was significantly higher than other regions, generally between 300 ~ 700 g C · m-2 · a-1; plateau meadow and shrub mainly distributed in the southern and central part of the region, NPP generally 100 ~ 300 g C · m-2 · a-1 in most areas in central and north-western regions due to the strong continental climate control, mainly distributed sparse vegetation, NPP mostly below 100 g C · m-2 · a- 1, which Qaidam Basin in Qinghai Productivity minimum area, almost 0 g C · m-2 · a-1. The simulation results with MODIS NPP products the data and GLOPEM-CEVSA model simulation results have a good consistency, in Qinghai that NPP-EMSC model has some applicability. Qinghai region vegetation NPP showed significant seasonal variation, summer, winter is almost zero. The Qinghai NPP-EMSC model simulated NPP data and the regional precipitation, annual accumulated data, analysis of NPP and precipitation, accumulated temperature relationship. The results showed that the NPP with single factor annual accumulated precipitation has a good correlation with the single elements poor correlation. Rainfall of less than 450 mm in the region, the contribution of precipitation on NPP and precipitation areas greater than 450 mm, the annual accumulated contribution of NPP. NPP and terrain elements (DEM, slope, aspect) analysis results show that the Qinghai region NPP with the rise of altitude and slope lower flat and the southern slope NPP is relatively low, to analyze the reasons may be larger in the area of ??human activity intensity due.

Estimation of Net Primary Productivity in Qinghai Province with LUE Model

Abstract

Related Dissertations