Establishment of Inventory on Carbon and Nutrient Cycling in Tropical Peatland Ecosystems for Sustainable Agro-production and Environmental Conservation

建立热带泥炭地生态系统碳和养分循环清单，促进可持续农业生产和环境保护

基本信息

批准号：
13574012
负责人：
HATANO Ryusuke
金额：
$ 8.51万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Tropical peatland is important for net carbon (C) storage in the global land surface, but it is also believed to be a major emission source of CH4.Land resource exploitation and burning of peat increases C release from the peatland, and thus contributes to overall global warming. In order in discern the magnitude of agricultural and fire impacts in tropical peatlands on global warming, ground surface emissions of three major greenhouse gases (GHG), CO2, CH4 and N2O, were measured in various ecosystems including forests and agricultural fields, as well as fire-affected lands in Karampangan zone, near Plangka Raya, from 2001 to 2003.After forest burning, the GWP decreased in 32-42% of the GWP from the natural forest, with 99% of the GWP occurring from CO2 emission. However, no trees could absorb the CO2, so the CO2 emissions went directly to the atmosphere.CH4 was emitted from the burned peatland, while CH4 uptake was observed in both the natural and regenerated forests.The GWP in the agricultural field was approximately 2 times larger than that from the natural forest. CO2 emission in the agricultural field was about 5 times larger than that in Japanese crop fields and accounted for 50-90% of the GWP. The remaining GWP was contributed by N2O emission. The N2O emission was considerably high, accounting for 4-23% of the nitrogen (N) application rate of 626 kg N ha1 yr-1.This is probably due to high peat decomposition and high nitrification enhanced by high pH and high exchangeable Ca content us the agricultural fields.Magnitude of forest fire impact on global warming was much higher than agricultural impact. But nitrogen application in agricultural field, which may accelerate peas decomposition, enhanced N2O emission and deduced CH4 uptake.

热带泥炭地对于全球陆地表面的净碳 (C) 储存非常重要，但它也被认为是 CH4 的主要排放源。土地资源开发和泥炭燃烧增加了泥炭地的碳释放，从而有助于整体碳排放。全球暖化。为了了解热带泥炭地农业和火灾对全球变暖的影响程度，测量了各种生态系统（包括森林和农田）以及三种主要温室气体（GHG）CO2、CH4和N2O的地表排放量。 2001 年至 2003 年，Plangka Raya 附近的 Karampangan 地区受火灾影响的土地。森林燃烧后，全球升温潜能值较自然值下降了 32-42%。森林，99%的全球升温潜能值来自二氧化碳排放。然而，没有树木能够吸收CO2，因此CO2排放直接排入大气。CH4是从燃烧的泥炭地中排放出来的，而在天然林和再生林中都观察到了CH4的吸收。农业领域的GWP约为2倍比天然林更大。农业领域的二氧化碳排放量约为日本农作物领域的5倍，占全球升温潜能值的50-90%。剩余的 GWP 由 N2O 排放贡献。 N2O 排放量相当高，占 626 kg N ha1 yr-1 氮 (N) 施用量的 4-23%。这可能是由于高 pH 值和高交换性 Ca 含量增强了泥炭分解和高硝化作用我们的农业领域。森林火灾对全球变暖的影响程度远高于农业影响。但在农业领域施用氮肥，可能会加速豌豆的分解，增加N2O的排放，减少CH4的吸收。