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70 华 中 农 业 大 学 学 报 第 41 卷

［36］ XU H J，WANG X H，LI H，et al.Biochar impacts soil mi⁃ acidic soil planted with rape［J］. Environmental science &
crobial community composition and nitrogen cycling in an technology，2014，48（16）：9391-9399.

Effects of biochar from different feedstocks on soil nitrogen
transformation and physicochemical properties in acid red soil

1
1,2
1
1
WANG Jiyuan ,XIA Hao ,LI Yuxuan ,WANG Xiangling ,JIANG Cuncang 1,2
1. College of Resources and Environment/Microelement Research Center，
Huazhong Agricultural University，Wuhan 430070，China；
2. College of Agriculture，Shihezi University/Key Laboratory of Oasis Eco-Agriculture，
Xinjiang Production and Construction Corps，Shihezi 832000，China

Abstract To investigate the effects of biochar from different feedstocks on acid soil improvement, ni⁃

trogen(N) mineralization and nitrification, acid red soil was selected as experiment material, and different bio⁃
char prepared from rice straw, rice husk and wood were added to carry out a 50⁃day indoor culture experi⁃
ment. Five treatments had been set: CK (control), F ( chemical fertilizer), B 1 (rice straw biochar with chemi⁃
cal fertilizer), B 2 (rice husk biochar with chemical fertilizer), B 3 (wood biochar with chemical fertilizer). The
soil basic physic⁃chemical properties, enzyme activity and the contents of ammonium N and nitrate N were
determined to analyze the relationship between soil properties and N transformation. The results showed that
rice straw biochar improved soil pH better than wood biochar and rice husk biochar. Compared with CK and
F treatment, the soil pH in B 1 treatment increased by 0.10 and 0.64 units, respectively. Besides, the contents
of soil organic matter, total N, available phosphorus and available potassium in B 1 treatment were also signifi⁃
cantly higher than that of other treatments. Furthermore, the application of fertilizer (F) and biochar (B 1, B 2,
B 3) significantly increased the soil N mineralization rate and nitrification rate, and there were significant differ⁃
ences in different biochar treatments. Throughout the 50⁃day experiment,compared to F treatment,the aver⁃
age N mineralization rates in B 1, B 2 and B 3 treatments decreased by 81.5%, 87.6% and 28.1%, respectively.
Meanwhile, treatment B 1 and B 3 could hold soil nitrate N and increase the nitrification rate by 12.0% and
16.0%, respectively, while B 2 treatment reduced the nitrification rate by 18.5%. In addition, the soil carbon
and N cycle⁃related enzymes activity in different biochar treatments were significantly different. Totally, the
results indicated that biochar from different feedstocks have different effects on the physic⁃chemical properties
of acid red soil, and the differences of soil properties could affect the N transformation, and rational applica⁃
tion of biochar can hold soil N and reduce N loss.
Keywords biochar；acid red soil；soil physicochemical properties；nitrogen mineralization；nitrifica⁃

tion；soil enzyme activity

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