AGROFORESTRY SYSTEMS - SOURCES OR SINKS OF GREENHOUSE GASES

被引：129

作者：

DIXON, RK

机构：

[1] US Support for Country Studies to Address Climate Change, Washington, DC 20585, 1000 Independence Avenue, SW

来源：

AGROFORESTRY SYSTEMS | 1995年 / 31卷 / 02期

关键词：

GLOBAL CHANGE; CARBON DIOXIDE; METHANE; ENVIRONMENT; CLIMATE;

D O I：

10.1007/BF00711719

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

The prominent role of forestry and agroforestry systems in the flux and long-term storage of carbon (C) in the terrestrial biosphere has increased global interest in these land-use options to stabilize greenhouse gas (GHG) emissions. Preliminary assessments suggest that some agroforestry systems (e.g., agrosilvicultural) can be CO2 sinks and temporarily store C, while other systems (e.g., ruminant-based silvopastoral systems) are probably sources of GHG (e.g., CH4). Agroforestry;systems can be significant sources of GHG emissions, especially at low latitudes. Practices such as tillage, burning, manuring, chemical fertilization, and frequent disturbance can lead to emission of CO2, CH4, and N2O from soils and vegetation to the atmosphere. Establishment and management of agroforestry systems incompatible with prevailing edaphic and climatic conditions can accelerate soil GHG emissions. Non-sustainable agroforestry systems are quickly degraded, and woody and herbaceous crops can become significant GHG sources. Silvopastoral systems can result in soil compaction and erosion with significant loss of labile C and N compounds to the atmosphere. Ruminant-based silvopastoral systems and rice paddy agrisilvicultural systems are well documented sources of CH4 which significantly contribute to the global CH4 budget. Early assessments of national and global terrestrial CO2 sinks reveal two primary beneficial attributes of agroforestry systems: 1) direct near-term C storage (decades to centuries) in trees and soils, and, 2) potential to offset immediate GHG emissions associated with deforestation and subsequent shifting agriculture. Within the tropical latitudes, it is estimated that one ha of sustainable agroforestry can provide goods and services which potentially offset 5-20 ha of deforestation. At a global scale, agroforestry systems could potentially be established on 585-1275 x 10(6) ha of technically suitable land, and these systems could store 12-228 (median 95) Mg C ha(-1) under current climate and edaphic conditions.

引用

页码：99 / 116

页数：18

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