摘要
茶树是我国广泛种植的一种高需氮经济植物。目前,尽管茶园生态系统中已开展了一些模拟氮肥施用的实验,但对于合成氮肥如何影响茶园土壤性质、养分供应及活性氮的流失仍缺乏全面的评估和量化。对2004—2016年间发表的相关研究数据进行整合分析,结果显示,施用合成氮肥导致我国茶园土壤p H平均降低0.20,使土壤总无机氮升高172%,对土壤有机碳、有效磷和钾离子浓度无影响。合成氮肥使土壤钙、镁离子浓度分别降低了23%和37%,铝离子浓度上升了近54%。同时,使土壤N_2O排放和无机氮淋溶分别增加292%和127%。总体上,大量施用合成氮肥加剧了我国茶园土壤酸化和养分元素的流失,增加了活性氮的流失,威胁着我国茶园生态环境的可持续发展。
【Objective】Tea（Camellia sinensis L.Kuntze）is a perennial plant widely cultivated in South China.As a high N-demanding cash crop,tea has been applied widely with synthetic N fertilizers to increase its yield.However,application of excessive synthetic N fertilizers in tea gardens might affect chemical properties of the soils and their nutrient supply to tea plants;in addition,it may have some negative impacts on growth of the tea plants and the environment.Although researchers in China have been doing some experiments simulating application of synthetic N fertilizers in tea gardens,so far none of them has been doing to systematically or quantitatively evaluate responses of tea soils to application of synthetic N fertilizer.Through meta-analysis,this paper tries to evaluate quantitatively how application of synthetic N fertilizers affect basic chemical properties and nutrient supply of the soil,and loss of reactive N to the environment.【Method】In this paper,meta-analysis was done of the 17 papers published in the literature during 2004-2016 involving 15 indicesin 246 items of data and records.【Result】Results indicated that application of synthetic N fertilizers lowered soil p H significantly by 0.20 units on average.In soils of tea gardens different in tea tree species,application of synthetic N fertilizers significantly decreased soil p H and no significant difference was found between subgroups.Soil acidification in the tea gardens was expedited because the application accelerated nitrification process,triggered loss of base cations,and damaged the soil buffering system,thus resulting H^＋release.As a whole,application of synthetic N fertilizers had on significant impact on soil organic carbon（SOC）.However,it did increase SOC by 15%（7%-24%）in tea gardens of green tea and by nil in tea gardens of oolong tea.Application of synthetic N fertilizers increased soil total N by 18%（10%-27%）,and soil dissolved inorganic N availability by 172%（127%-236%）.The responses of soil DIN,NH4^＋-N a
出处
《土壤学报》
CAS
CSCD
北大核心
2018年第1期174-181,共8页
Acta Pedologica Sinica
基金
中国博士后科学基金(2017M612390)
河南省科技计划项目(172102110254)
信阳师范学院青年骨干教师资助计划(2017GGJS-12)资助~~
关键词
合成氮肥
土壤酸化
养分供应
无机氮淋溶
N2O排放
Synthetic nitrogen fertilizers
Soil acidification
Nutrient supply
Dissolved nitrogenleaching
N2O emission
