1.Guangxi Key Laboratory of Forest Ecology and Conservation,State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources,College of Forestry,Guangxi University,Nanning 530004,China
2.Key Laboratory of Agro-Ecological Processes in Subtropical Region,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,China
Objective To investigate the effects of biochar combined with nitrification/urease inhibitors and straw mulching on nitrogen and phosphorus leaching under in situ field conditions, aiming to provide scientific evidence for controlling nitrogen and phosphorus leaching in tea plantations. Methods A red soil hillslope tea plantation in the subtropical region was selected as the study area. Five treatments were established: no fertilization (CK), conventional fertilization (CON), biochar addition (BC), biochar combined with nitrification/urease inhibitors (BNI), and straw mulching (RS). Over a one-year observation period, changes in soil physicochemical properties and leaching losses of nitrogen and phosphorus under natural rainfall conditions were monitored. Results During the observation period, compared to the CON treatment, the BNI treatment exhibited the highest soil ammonium nitrogen and nitrate nitrogen mass fractions, which were 2.8% and 72.8% higher, respectively. The higher ammonium nitrogen and nitrate nitrogen levels in the BNI treatment led to an increase of total nitrogen concentration in the leaching solution. Soil nitrogen and phosphorus leaching primarily occurred during the rainy spring and summer seasons. The BC treatment showed the highest leaching coefficient at 24.3%, while the RS treatment had the lowest at 8.3%. For total nitrogen loss in leaching solution, the BNI treatment (275.0 kg/hm2) was highest, and the RS treatment (65.9 kg/hm2) was the lowest. For total phosphorus loss, particulate phosphorus was the dominant form of loss, with the BC treatment yielding the highest loss (201.5 g/hm2) and the RS treatment the lowest (32.4 g/hm2). Compared with the CON treatment, the RS treatment reduced total nitrogen loss in leaching solution by 43.6%, while the BNI and RS treatments decreased total phosphorus loss by 39.1% and 77.2%, respectively. Conclusion Considering both soil plant-available nutrient content and the effectiveness in controlling nitrogen and phosphorus leaching, straw mulching is an effective management practice for reducing nitrogen and phosphorus losses in tea plantations.
Notice of the Ministry of Agriculture and Rural Affairs on the issuance of the "14th Five-Year Plan" national planting industry development plan[J].Bulletin of the Ministry of Agriculture and Rural Affairs of the People's Republic of China,2022(2):26-43.
NIK, LIAOW Y, YIX Y, et al. Fertilization status and reduction potential in tea gardens of China[J].Journal of Plant Nutrition and Fertilizers,2019,25(3):421-432.
ZENGL X, XIAOW F, HUANGZ L, et al. Characteristics of nutrient loss of Lanlingxi watershed in the Three Gorges Reservoir area[J].Environmental Science,2013,34(8):3035-3042.
HANX F, GAOM, XIED T, et al. Reduction effect of reduced phosphorus fertilizer and combining organic fertilizers on phosphorus loss of purple soil sloping field[J].Environmental Science,2016,37(7):2770-2778.
WUJ S, LIY, LIY Y, et al. Controlling mechanisms and technology demonstrations of agricultural non-point source pollution in subtropical catchments[J].Research of Agricultural Modernization,2018,39(6):1009-1019.
[11]
AHUJAL R, SHARPLEYA N, YAMAMOTOM, et al. The depth of rainfall-runoff-soil interaction as determined by 32P[J].Water Resources Research,1981,17(4):969-974.
FUS F, XUY, NIUS W, et al. Research progress of control measures for soil N leaching in dry farmland[J].Environmental Science and Technology,2020,43(6):161-168.
JIANGB S, SHENJ L, WANGJ, et al. Effect of straw incorporation on biologically-based phosphorus fractions and phosphorus uptake by rice in paddy field[J].Journal of Soil and Water Conservation,2020,34(6):309-317.
[16]
VAN ZWIETENL, KIMBERS, MORRISS, et al. Effects of biochar from slow pyrolysis of papermill waste on agronomic performance and soil fertility[J].Plant and Soil,2010,327(1):235-246.
WANGF, CHENY Z, YOUZ M, et al. Effect of biochar (Camellia sinensis) addition on nitrogen leaching in strong acid tea garden soils[J].Journal of Soil and Water Conservation,2015,29(1):111-115.
[19]
CAOD Y, LANY, CHENW F, et al. Successive applications of fertilizers blended with biochar in the soil improve the availability of phosphorus and productivity of maize (Zea mays L.)[J].European Journal of Agronomy,2021,130:e126344.
ZHANGY, LIH H, HEX S, et al. Effect of different external materials on the leaching and movement characteristics of soil phosphorus[J].Agricultural Research in the Arid Areas,2017,35(5):151-156.
[22]
LIY Y, FENGG, TEWOLDEH, et al. Soil, biochar, and nitrogen loss to runoff from loess soil amended with biochar under simulated rainfall[J].Journal of Hydrology,2020,591:e125318.
[23]
HARDIEM A, OLIVERG, CLOTHIERB E, et al. Effect of biochar on nutrient leaching in a young apple orchard[J].Journal of Environmental Quality,2015,44(4):1273-1282.
SHIY X. Effects of urease/nitrification inhibitor application on tomato yield, quality and the influence of nitrogen utilizaton research[D].Baoding, Hebei: Agricultural University of Hebei,2014.
[26]
HET H, YUANJ J, XIANGJ, et al. Combined biochar and double inhibitor application offsets NH3 and N2O emissions and mitigates N leaching in paddy fields[J].Environmental Pollution,2022,292:e118344.
[27]
LANT, HEX Q, WANGQ, et al. Synergistic effects of biological nitrification inhibitor, urease inhibitor, and biochar on NH3 volatilization, N leaching, and nitrogen use efficiency in a calcareous soil-wheat system[J].Applied Soil Ecology,2022,174:e104412.
QIL B, ZHOUW J, GUOH Y, et al. Phosphorus nutrient characteristics of tea plantation soils under rice-straw mulch and white-clover intercropping in hilly red-soils of south China[J].Chinese Journal of Eco-Agriculture,2008,16(3):593-597.
SHANW X, LUOW, XIAOR L, et al. Effect of 5-year rapeseed cake fertilization and straw mulching on tea plantation soil ecosystem[J].Chinese Journal of Eco-Agriculture,2010,18(3):472-476.
[32]
WANGK K, RENT, YANJ Y, et al. Straw returning mediates soil microbial biomass carbon and phosphorus turnover to enhance soil phosphorus availability in a rice-oilseed rape rotation with different soil phosphorus levels[J].Agriculture,Ecosystems and Environment,2022,335:e107991.
LIZ, WUP T, FENGH, et al. Simulated experiment on effect of soil bulk density on soil infiltration capacity[J].Transactions of the Chinese Society of Agricultural Engineering,2009,25(6):40-45.
[35]
TAMMEORGP, SIMOJOKIA, MÄKELÄP, et al. Short-term effects of biochar on soil properties and wheat yield formation with meat bone meal and inorganic fertiliser on a boreal loamy sand[J].Agriculture, Ecosystems and Environment,2014,191:108-116.
[36]
CASTELLINIM, GIGLIOL, NIEDDAM, et al. Impact of biochar addition on the physical and hydraulic properties of a clay soil[J].Soil and Tillage Research,2015,154:1-13.
SUNN T, WANGX Y, ZHOUH, et al. Effects of kind and incorporation depth of biochars on water movement and nitrogen and phosphorus loss in purple soil[J].Acta Pedologica Sinica,2022,59(3):722-732.
QIR P, ZHANGL, YANY H, et al. Effects of biochar addition into soils in semiarid land on water infiltration under the condition of the same bulk density[J].Chinese Journal of Applied Ecology,2014,25(8):2281-2288.
WANGS R, ZHANGQ, WANGY, et al. Effects of furrows straw mulching on structure and water content of topsoil[J].Journal of Jilin Agricultural University,2021,43(5):581-584.
TUD, MAOT X. Effect of biochar addition on saturated hydraulic conductivity of yellow soil in karst areas[J].Research of Soil and Water Conservation,2021,28(5):108-113.
ZHANGQ W, CHENS H, LIUD H, et al. Effects of agricultural activities on runoff, sediment and erodibility of purple soil from sloping cropland[J].Journal of Nuclear Agricultural Sciences,2016,30(7):1395-1403.
ZHENGF J, WANGX, LIS P, et al. Synergistic effects of soil moisture, aggregate stability and organic carbon distribution on wheat yield under no-tillage practice[J].Scientia Agricultura Sinica,2021,54(3):596-607.
TAOP C, CHENX M, JINZ W, et al. Effects of biochar combined with nitrogen fertilizers on microbial biomass C, N and carbon-to-nitrogen ratio of upland red soil[J].Journal of Soil and Water Conservation,2016,30(1):231-235.
LIZ R, WEIG L. Effects of biochar with different additive amounts on the leaching loss of nitrogen and phosphorus in soils[J].Ecology and Environmental Sciences,2016,25(2):333-338.
MAS L, KUANGF H, LINH Y, et al. Effects of straw incorporation quantity on soil physical characteristics of winter wheat-summer maize rotation system in the central hilly area of Sichuan basin[J].Scientia Agricultura Sinica,2023,56(7):1344-1358.
[59]
PIONKEH B, GBUREKW J, SCHNABELR R, et al. Seasonal flow, nutrient concentrations and loading patterns in stream flow draining an agricultural hill-land watershed[J].Journal of Hydrology,1999,220(1/2):62-73.
[60]
李娟.不同施肥处理对稻田氮磷流失风险及水稻产量的影响[D].杭州:浙江大学,2016.
[61]
LIJ. Effects of different fertilization treatments on rice yield and the risk of nitrogen and phosphorus losses from paddy field[D].Hangzhou: Zhejiang University,2016.
DAIY F, LIY M, FANM P, et al. The study on phosphorus sorption-desorption capacity of different biochar and the effects of its amendment to soil[J].Journal of Shanxi Agricultural University (Natural Science Edition),2016,36(5):345-351.
CHUJ, XUEJ H, JINM J, et al. Review of researches on effects of biochar in reducing nitrogen and phosphorus losses with agricultural nonpoint source pollution[J].Journal of Ecology and Rural Environment,2014,30(4):409-415.