摘要
采用室内土柱淋滤试验研究了生物黑炭施用量对强酸性茶园土壤淋溶液体积、pH以及NH＋4-N和NO-3-N淋溶的影响。试验中所用生物黑炭以茶树枝条为原料制成,土柱中生物黑炭用量设B0（0t/hm^2）、B1（8t/hm^2）、B2（16t/hm^2）、B3（32t/hm^2）和B4（64t/hm^2）5个处理。结果表明：与对照处理相比,B1、B2、B3和B4土壤淋溶液体积分别下降了1.84%,3.43%,5.99%和11.09%;随生物黑炭施用量的增加,淋溶液pH和土壤pH也逐渐增加;B1、B2、B3和B4 4个土柱的NH＋4-N淋失量分别降低了1.84%,2.82%,11.37%和9.75%,NO-3-N淋失量分别显著降低了36.24%,43.65%,44.39%和62.40%;在整个淋洗过程中,NH＋4-N和NO-3-N淋溶主要发生在前5次,且主要以NO-3-N的形式淋失,其累积淋溶量占NH＋4-N、NO-3-N淋溶总量的57.61%-76.54%;生物黑炭降低了土壤中NH＋4-N（B4处理除外）和NO-3-N含量。以上结果表明,生物黑炭施用能明显增加土壤pH,减少NH＋4-N和NO-3-N的淋失,增强土壤的持续供氮能力。
By the pillar leaching experiment,the effects of biochar application on the leachate volume,pH,ammonium nitrogen（NH＋4-N）and nitrate nitrogen（NO-3-N）concentration in strong acid tea garden soils were studied in this paper.The biochar was made with the branches clipped from tea plant,and the application rates were B0（0t/hm^2）,B1（8t/hm^2）,B2（16t/hm^2）,B3（32t/hm^2）and B4（64t/hm^2）,respectively.The results showed that,compared with the control,the leachate volume of the B1,B2,B3 and B4treatments decreased by 1.84%,3.43%,5.99%and 11.09%,respectively,the leachate and soil pH increased with the biochar application rates.In addition,in the treatments of B1,B2,B3 and B4,the leaching amount of NH＋4-N decreased by 1.84%,2.82%,11.37%and 9.75%respectively,and to which of the NO-3-N were 36.24%,43.65%,44.39% and 62.40%,respectively.Moreover,in the leaching process,the leaching of NH＋4-N and NO-3-N major occurred in the first five times,and the main section in which was NO-3-N,for its leaching amount accounted for 57.61% to 76.54% of the total leaching volume.Biochar application decreased soil NH＋4-N（except B4treatment）and NO-3-N content.These results indicated that the biochar application in strong acid tea garden soils could significantly increase soil pH,reduce the nitrogen leachate and enhance the continuous capability of soil nitrogen supplying.
出处
《水土保持学报》
CSCD
北大核心
2015年第1期111-115,共5页
Journal of Soil and Water Conservation
基金
国家茶产业体系宁德站研究项目(CARS-23-9)
国家科技支撑计划项目(2014BAD15B01)
福建省农业科学院创新团队项目(STIT-Ⅰ-0302
STIT-Ⅰ-0305)
福建省农业科学院青年创新基金项目(2013DQB-17)
关键词
生物黑炭
茶树枝条
茶园土壤
氮素淋失
biochar
Camellia sinensis clips
tea garden soil
nitrogen leaching
