Effects Of Biochar Application On Carbon Sequestration And Greenhouse Gases Emission In Moso Bamboo Forests

Moso bamboo?Phyllostachys heterocycla var.pubescens?is an important forest resource and it has a great potential of carbon?C?sequestration and mitigating climate change.Thus,how to increase the C sequestration of bamboo forests to mitigate climate change had attracted people's attention.However,long-term management of bamboo forests leads to soil fertility decline and soil acidification,which indirectly affects the C sequestration capacity of aboveground vegetation.Biochar as a stable organic carbon can increase soil fertility and soil C sink capacity,and amending soil with biochar is a potential method to mitigate climate change.We conducted a 12-month field study in Moso bamboo forest to investigate the effects of biochar amendment on vegetation C sequestration,soil organic carbon?SOC?stocks and soil greenhouse gas?GHG?emissions.This experiment was conducted in Moso bamboo forest with appropriate managed condition,slopes and same site conditions in the BamQiao forest farm in Lin'an,Hangzhou in Zhejiang Province.We investigated the effects of different rates of biochar application with three repetitions(CK:0 Mg ha^-1;B1:5 Mg ha^-1;B3:15 Mg ha^-1)on GHG?CO₂,CH₄,N₂O?emission,soil physical and chemical properties,soil C pool and vegetation C pool in Moso Bamboo forests,and the relationship between soil GHG and environment factors.The aim of this study was to reveal changes and mechanisms of the soil and vegetation C storage,and GHG emissions in Moso bamboo forests with biochar amendment in the first year.The main findings are as follows:?1?Compared with CK,the annual C sequestration increased 185.28%and 46.83%in B1 and B3 in Moso bamboo forests,respectively,of which soil GHG emission increased 20.54%and 19.86%,SOC storage increased by 52.49%and 11.70%and bamboo forest vegetation carbon storage increased by 75.86%and 68.25%,respectively.B1 treatment can significantly improve the C sequestration of the bamboo forest ecosystem.?2?After amending soil with biochar,the C density in bamboo stem was higher than its branch and leaf,and in 1du was higher than 2du and 3du.Compared with CK,biochar amendment with B1was significantly increased the C density of 1du in bamboo stem,but significantly decreased the C density of 1du in bamboo branch.There had no significant difference in the C density of undergrowth vegetation.?3?Compared with CK,the annual soil CO₂ emission increased 21.59%and 20.59%in B1 and B3 in Moso bamboo forests,respectively.But there was no significant difference between different treatment?P>0.05?.The soil CO₂ emission was significant influenced by soil 5cm temperature,WSOC and MBC.?4?Compared with CK,the annual soil CH₄ uptake increased 15.79%and 5.26%in B1 and B3in Moso bamboo forests,respectively.And there had a significant difference between CK and B1?P<0.05?.The soil CH₄ uptake was significant influenced by soil 5cm temperature and WSOC.?5?Compared with CK,the annual soil N₂O emission decreased 26.09%and 14.13%in B1 and B3 in Moso bamboo forests,respectively.And there had a significant difference between CK and biochar treatment?P<0.05?.The soil 5cm temperature,soil pH,MBN,NH₄⁺-N and NO₃^--N had significant positively influenced on the soil N₂O emission,but the soil moisture had significant negatively influenced on it.