Modelling environmental effects on ecosystem productivity under diverse climates, soils and land use practices with the ecosystem simulation model ecosys

目前正在利用基于过程的生态系统模拟模型，对气候、干扰、土地利用和土壤质量假设变化下的生态系统生产力和温室气体交换变化进行预估。开发和测试这些模型是加拿大碳计划（CCP）和北美碳计划（NACP）等国家和国际研究项目的既定目标。我的研究项目致力于构建和测试自然和管理生态系统的综合数学模型（ecosys）。该模型基于几个组成学科的基本原理，包括生物气象学，植物生物学，植物生物化学，农学，土壤生物学，土壤物理学和土壤化学。这项研究的创新之处在于将这些原理整合成一个单一的数学实体，可以再现陆地生态系统的复杂行为。我的项目的长期目标是提供一种方法来预测生态系统对环境条件（土壤、气候、干扰和土地利用）假设变化的反应（碳、营养、水状况的变化）。在这些长期目标中，我建议在生态学中测试控制生态系统生产力对(1)泥炭地水文和(2)作物变暖反应的过程的模拟。这项测试将得到最近的测量结果的支持(1)中国共产党泥炭地的连续水转移和二氧化碳交换，以及(2)美国农业部农业部农业部在自然大田条件下控制作物变暖。水文和变暖对生产力的影响的模拟是基于独立实验室研究确定的基本物理和生物过程的动力学，但尚未在实地条件下进行试验。在我担任首席研究员或共同研究员的不同国家研究项目中，拟议的工作将有助于生态系统对受气候、土壤质量和土地利用影响的不同生态系统生产力变化的预测能力。

Projections of changes in ecosystem productivity and greenhouse gas exchange under hypothesized changes in climate, disturbance, land use and soil quality are being made using process-based ecosystem simulation models. The development and testing of such models is a stated objective of national and international research projects such as the Canadian Carbon Program (CCP) and the North American Carbon Program (NACP). My research program is dedicated to the construction and testing of a comprehensive mathematical model (ecosys) of natural and managed ecosystems. This model is based upon fundamental principles in several component disciplines, including biometeorology, plant biology, plant biochemistry, agronomy, soil biology, soil physics, and soil chemistry. The innovative nature of this research lies in the integration of these principles into a single mathematical entity that can reproduce the complex behaviour of terrestrial ecosystems. The long-term objectives of my program are to provide a means to anticipate ecosystem response (changes in C, nutrient, water status) to hypothesized changes in environmental conditions (soils, climates, disturbance and land use). Within these longer-term objectives, I propose to test the simulation in ecosys of processes that control the responses of ecosystem productivity to (1) hydrology in peatlands, and (2) warming in crops. This testing will be supported by recent measurements of (1) continuous water transfer and CO2 exchange in peatlands in the CCP, and (2) controlled warming of crops under natural field conditions by the USDA-ARS. The simulation of hydrological and warming effects on productivity is based upon kinetics of basic physical and biological processes established from independent laboratory studies, but not as yet tested under field conditions. The proposed work will contribute to the predictive capability of ecosys for changes in the productivity of diverse ecosystems as affected by climate, soil quality and land use in different national research projects in which I am a principal investigator or co-investigator.