水保所知识产出(1956---)知识库

为确定生物炭添加对半干旱地区农田土壤温室气体释放的影响，采用小区定位试验，利用锯末( J) 和槐树皮( H) 及3 种
添加比例( 1%、3%、5%，质量百分比) ，研究了生物炭添加6 个月内表层土壤CO2、CH4
和N2O 等3 种温室气体排放的动态
变化． 结果表明，与对照相比，各处理土壤CO2
排放通量随生物炭的添加呈现增加的趋势，锯末和槐树皮等两种生物炭处理
的土壤CO2
平均排放通量分别增加了1. 89%和3. 34%，但差异不显著． CH4
排放随着生物炭添加量的增加而降低，各生物炭
处理的土壤表层CH4
排放量平均降幅分别为: J1: 1. 17%、J3: 2. 55%、J5: 4. 32%、H1: 2. 35%、H3: 5. 83%、H5: 7. 32%．
其中，锯末生物炭仅在5%添加量时较对照差异显著( P ＜ 0. 05) ，而槐树皮生物炭处理在3%和5% 的添加量与对照差异均达
显著水平( P ＜ 0. 05) ． 生物炭对N2O 的排放影响没有明显规律性． 研究表明，生物炭在短期内对半干旱地区农田土壤CO2
和
N2O 的排放没有显著影响，而对CH4
排放则影响显著( P ＜ 0. 05) ． 就生物炭类型而言，槐树皮生物炭在抑制CH4
排放方面优
于锯末生物炭，差异显著( P = 0. 048) ．

This study aimed to investigate the effects of biochar addition on the emission of greenhouse gases from farmland soil in semiarid
region． Through an in-situ experiments，the influence of sawdust biochar( J) and locust tree skin biochar( H) at three doses
( 1%，3%，and 5% of quality percentage) on CO2
，CH4 and N2O emissions were studied within the six months in the south of Ningxia
province． The results indicated that soil CO2 emission flux was slightly increased with the addition doses for both biochars，and the
averaged CO2 emission flux for sawdust and locust tree skin biochar was enhanced by 1. 89% and 3. 34% compared to the control，but
the difference between treatments was not statistically significant． The soil CH4 emission was decreased with the increasing of biochar
doses，by 1. 17%，2. 55%，4. 32% for J1，J3，J5 and 2. 35%，5. 83%，7. 32% for H1，H3，H5，respectively． However，the
difference was statistically significant only for J5，H3 and H5 treatments ( P ＜ 0. 05) ． Across addition doses，there was no apparent
effect on soil N2O emission． Our study indicated that the biochar has no significant influence on soil CO2 and N2O emissions within six
months in semi-arid region and can significantly influence soil CH4 emissions( P ＜ 0. 05) ． As for biochar type，the locust tree skin
biochar is significantly better than the sawdust biochar in terms of restraining CH4 emission( P = 0. 048) ．