第八章土壤空气 soil air Integration at the local and regional scales Far m and watershed Greenhouse gases, Precision far ming 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 Caboratory and small plots] N, P, K, heavy metals Soil organic matter and structure Rhizobium and microflora, etc Water
第八章 土壤空气 soil air
Gases 02 Oxygen gas O3 ozone H2 Hydrogen gas N2 Nitrogen gas or dinitrogen N,o Nitrous oxide NOx= N,o+ No no, H3 Ammonia CO Carbon dioxide CHA Methane so Sulfur dioxide
土壤空气的组成特点 Atmospheric Air vs Soil Air o volume Sampl lle CO2 CH4 Air 78 0.035 trace Soil air 78 20 0.35 trace (0-200)(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c02释放与固定问题成为当今土壤科学发便的前沿领域!
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！
Gibal Net Prmary Isetan 丶 asphere and记 empiral Fossil fuels Vegetation 6lll changn 500 s a Lane lse Detritus 1.80 Surface Ocean 4 1,020 Marine Biota Rivers Ileen Ocean 38100 Surface Sediment Soares schimel 18 Fig. 11.2. The Global Carbon Cycle
370 360 A△AA 550 340 Manthly 3in Annual 300 29 8荡影§了§ 强量虽盛盛 Fig. 11.1. Atmospheric co, concentration trend at Mauna Loa Station (1958-1996) Credit: Ermironment canada