一.土壤卫生的意义 土壤的物理、化学及生物学特性会不同程度地影响以下几个方面: 1.水体、空气的质量 A.使水体的化学性状及微生物指标发生变化; B.土壤潮湿或沼泽化会使空气湿度增大;使有机物厌氧分解使空气中的有害气体增加。 C.冬季寒冷、夏季炎热,且家畜易发生疾病(感冒及风湿性疾病)

1、对偶原理的内容 电路中某些元素之间的关系(或方程)用它们 的对偶元素对应地置换后,所得的新关系(或新方程) 也一定成立,后者和前者互为对偶,称为对偶原理。 可以从一个元件的有关公式通过代换,导出另一 个元件的相应公式,这种方法称为对偶法; 可以互相代换的元素称为对偶元素; 可以实施对偶元素代换的两个公式称为对偶公式

Chap. 6 Climate/Change Impact methods Index, variables Statistical methods GCMs with downscaling

Chap. Climate/Change and Land Resources 5.1 Introduction 5.2 Assessment of land resources 5.3 Land productivity 5.4 Land degradation --Soil erosion

Chapter 3 3.4 Crop growth and its modeling 3.4.1 Components of plant growth 3.4.2 Empirical models 3.4.3 Process-based models 3.4.4 Case studies Date

Chap. Climate/Change and Agriculture 3.1 Environment and plant growth 3.2 Inventory of climate resources 3.3 Plant growth and crop growth models 3.4 Impacts of climate changes on agriculture

Chapter 3 Chap. Climate/Change and Agriculture 3.1 Environment and plant growth 3.2 Inventory of climate resources 3.4 Plant growth and crop growth models 3.5 Impacts of climate changes on agriculture

Course for graduate students Goals of the course Understanding of basic theories on impacts of climate/changes Knowing of basic tools or methods on assessment of climate/change impacts Applications in your interested field studies

Parallel Climate Model Effort (Version 1) This is a joint effort to develop a DOE-sponsored parallel climate model between Los Alamos National aboratory (LANL), the Naval Postgraduate School (NPG), the US Army Corps of Engineers' Cold

CCCma has develped a number of climate simulation models for climate prediction, study of climate change and variability, and to better understand the various processes which govern our climate system. A brief description of these models and their corresponding references can be found in this section