Effects of biochar amendment on nitrogen mineralization in black soil with different moisture contents under freeze-thaw cycles
Effects of biochar amendment on nitrogen mineralization in black soil with different moisture contents under freeze-thaw cycles
复制标题
冻融循环下生物炭改良剂对不同含水量黑土氮矿化的影响
DOI：
10.1016/j.geoderma.2019.07.027
复制
发表时间：
2019-11
期刊：
影响因子：
6.1
通讯作者：
Ji Yi
中科院分区：
文献类型：
--
作者：
Fu Qiang;Yan Jiawen;Li Heng;Li Tianxiao;Hou Renjie;Liu Dong;Ji Yi
冻融循环影响非生长季的氮素循环过程。通过室内模拟土柱FTC试验，研究了生物炭配合土壤水分对FTCS条件下氮素矿化的影响。在实验室研究中，对松嫩平原黑土中国进行了不同生物炭施用量(0%、2%和4%)、不同含水率(15%、20%和25%)和不同FTC数量的试验(每个FTC包括在−20 °C下冻结48 h和在10 °C下解冻48 h)。探讨了FTCS条件下土壤水分和团聚体的变化，以及生物炭施用量和不同水分含量对氮素有效性的影响。结果表明，FTCs促进了土壤团聚体的破碎和分解，这一过程还与土壤含水率和生物炭施用量有关。此外，生物炭的应用提高了土壤持水能力。土壤中的氨氮和硝态氮含量在FTCS期间呈先升后降的趋势，在第3次FTC后达到峰值。但受迁移转化过程的影响，冻融后土壤无机氮含量均高于初始水平。此外，氨氮含量随土壤初始含水率的增加而增加，随生物炭施用量的增加而减少。但硝态氮含量随土壤初始含水率和生物炭施用量的增加而增加。方差分析表明，FTCS和水分含量是影响氮素矿化的主要驱动因子(p <； 0.05)。本研究为季节性冻土地区农田土壤氮素调控和农业资源高效利用提供了指导。
Freeze-thaw cycles (FTCs) affect the nitrogen cycling process in the non-growing season. To explore the effects of biochar application combined with soil moisture on nitrogen mineralization under FTCs, a laboratory FTC test of simulated soil columns was conducted. In this laboratory study, black soil from the Songnen Plain, China, was subjected to different biochar application rates (0%, 2% and 4%), moisture contents (15%, 20% and 25%) and numbers of FTCs (each FTC consisted of freezing at −20 °C for 48 h and thawing at 10 °C for 48 h). We explored the changes in soil moisture and aggregates as well as the effects of biochar application and different moisture contents on nitrogen availability under FTCs. The results showed that FTCs promoted the fragmentation and decomposition of soil aggregates, processes that are also related to the moisture content and biochar application rate. Moreover, the application of biochar increased the soil water holding capacity. The ammonium nitrogen and nitrate nitrogen contents in the soil first increased and then decreased during the FTCs and peaked after the third FTC. However, influenced by transfer and transformation processes, the inorganic nitrogen contents were higher than the initial levels after freezing and thawing. In addition, the content of ammonium nitrogen increased with increasing initial soil moisture content but decreased with increasing biochar application rate. However, the content of nitrate nitrogen increased with increasing initial soil moisture content and biochar application rate. Analysis of variance showed that FTCs and moisture content are the major driving factors that affect nitrogen mineralization (p < 0.05). This study provides guidance for the regulation of farmland soil nitrogen and the efficient utilization of agricultural resources in areas with seasonally frozen soil.
登录
查看更多内容
冻融状态和土壤初始含水量对土壤侵蚀的影响
影响因子：
2.9
作者：
Liu Hongyuan;Yang Yang;Zhang Keli;Sun Chuanlong
通讯作者：
Sun Chuanlong
影响因子：
4.8
作者：
H. Sjursen;A. Michelsen;M. Holmstrup
通讯作者：
H. Sjursen;A. Michelsen;M. Holmstrup
影响因子：
5
作者：
C. Song;Yuesi Wang;Yiyon Wang;Zhi-chun Zhao
通讯作者：
C. Song;Yuesi Wang;Yiyon Wang;Zhi-chun Zhao
影响因子：
2.9
作者：
DeLuca, TH;MacKenzie, MD;Holben, WE
通讯作者：
Holben, WE
影响因子：
9.7
作者：
Nelissen, Victoria;Rutting, Tobias;Boeckx, Pascal
通讯作者：
Boeckx, Pascal