第八章土壤空气 soil air Integration at the local and regional scale Far m and watershed Greenhouse gases, Precision far min g Remote sensing, Soil survey, etc. Air Field and experi mental plots Far ming systems and crop management Soil air and water quality Weeds, etc Soil and Fine scale Rhizosphere [laboratory and small plots] N, P, K, heavy metals Soil organic matter and structure Rhizobium and microflora, etc vater
第八章 土壤空气 soil air
G ases en gas zone H 2 Hydrogen gas N, Nitrogen gas or dinitrogen N,o Nitrous oxide Nox= Ny0 t No t no NH3 Ammonia Co Carbon dioxide CHA Methane So Sulfur dioxide
士壤空气的组成特点 Atmospheric air vs Soil air (%o volume) Sample N2 CO? CH Air 78 0.035 trace Soil air 78 20 035 trace (0-20%)(0-5 土壤空气组成有以下分方面的特点 1.土壤空气中CO2>>近地层大气中CO2( Carbon dioxide 原因:(1)土壤有机物质的分解释放CO2 (2)土壤中根糸、微生物、土壤动物的呼吸释放CO2 (3)无机碳酸盐的分解CO2 研究土壤中C2释放与固定问题成为当今土壤科学发畏的前沿领域!
一.土壤空气的组成特点 土壤空气组成有以下分方面的特点: 1.土壤空气中CO2>>近地层大气中CO2 （Carbon dioxide） 原因：（1）土壤有机物质的分解释放CO2 (2) 土壤中根系、微生物、土壤动物的呼吸释放CO2 （3）无机碳酸盐的分解CO2 研究土壤中co2释放与固定问题成为当今土壤科学发展的前沿领域！
Gl bal Ne Prmary Pnduettn Atmesphere and Respiration Fossil fuels Vegetation bll 5、000 Sois ). s Ian Use Detritus 1.580 Surface Ocean 1,020 Marine biota vers IMN Surfacc Sediment Souree Schimel 1995 Adapted by: Craig Nicke Fig. 11.2. The Global Carbon Cycle
370 550 4 330 Air Monthly 531 Annual 300 Fig. 11.1. Atmospheric co, concentration trend at Mauna Loa Station(1958-1996 Credit: Emironment c anada