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| 利用整合分析方法探究我国不同土地利用类型区域河流硝酸盐的来源 |
| Sources of nitrate in rivers under different land-use types in China: A meta-analysis |
| 投稿时间：2020-09-06 |
| DOI：10.13254/j.jare.2020.0492 |
| 中文关键词: 硝酸盐，同位素，来源，土地利用类型，整合分析 |
| 英文关键词: nitrate, isotope, source, land use type, meta-analysis |
| 基金项目:国家科技重大专项（2018ZX07111003） |
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| 中文摘要: |
| 为揭示我国不同土地利用类型区域河流中硝酸盐来源，本研究收集了我国42个流域旱季、雨季的NO3--N浓度数据，以及δ15N-NO3和δ18O-NO3的特征值，并开展整合分析。结果表明，旱季河流的NO3--N、NH4+-N和Cl-浓度均显著高于雨季（P<0.05），其反应比lnR分别为0.20、0.54和0.14。整合分析表明，雨季河流中硝酸盐主要来自氮肥（相对比率RR=0.81），而旱季硝酸盐主要来自污水和粪便（RR=1.04）。我国不同土地利用类型区域河流硝酸盐的来源差异显著，其中城市用地主要受污水与粪便影响（RR=1.10），农业用地雨季受氮肥源（RR=0.77）、土壤氮源（RR=0.86）和污水与粪便源（RR=0.94）的共同影响。农业城市混合用地具有城市和农业用地的特征，旱季和雨季分别受污水粪便源（RR=1.23）和氮肥源（RR=0.58）的影响，而农林用地受人类活动影响较小。本研究为不同土地利用类型区域河流硝酸盐溯源提供了方向，为河流硝酸盐污染的控制提供了科学依据。 |
| 英文摘要: |
| Nitrate pollution in surface water has attracted global attention. In order to reveal the sources of nitrate in surface water under different land-use types in China, the concentrations of NO3--N, NH4+-N and Cl- and the characteristic values of δ15N-NO3 and δ18O-NO3 in 42 watersheds in dry and wet seasons were collected and evaluated by meta-analysis. Meta-analysis results showed that the concentrations of NO3--N(Response ratio, lnR=0.20) , NH4+-N(lnR=0.54) and Cl-(lnR=0.14) in the dry season were significantly higher than in the wet season(P<0.05) . The main source of nitrate in the wet season was nitrogen fertilizer(Relative rate, RR=0.81) , and in the dry season was manure and sewage(RR=1.04) . Meta-analysis results showed that land use type had a significant influence on the source of nitrate. Urban land was mainly affected by manure and sewage(RR=1.10) , and agricultural land was affected by nitrogen fertilizer(RR=0.77) , soil nitrogen(RR=0.86) and manure and sewage(RR=0.94) in the wet season. Agricultural urban mixed land had characteristics of both urban and agricultural land. Manure and sewage(RR=1.23) and nitrogen fertilizer(RR=0.58) were the main sources in agricultural urban mixed land in dry and wet seasons, respectively. Agricultural and forestry lands were less influenced by human activities. This study provides a direction for the traceability of nitrate sources in rivers from different land use types, and provides a scientific basis for the control of nitrate pollution in rivers crossing different land use types. |
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