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ZHANG Hong-ling1*, LI Tian-jiao1, ZHAO Zhi-Fang1, MA Guo-feng2, CHEN Su1, SUN Li-na1
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Abstract: Migration of nitrogen through runoff from cropland to river results in low utilization of fertilizer as well as water pollution and eutrophication. Proper riparian vegetation buffering between riverbank and cropland could protect the aquatic ecosystems. Four types of vegetation buffer strips (Artemisia strip, Lolium perenne strip, Salix integra +L. prenne strip, and Amorpha fruticosa +L. perenne strip) were constructed in Liaohe River protected area close to cropland. We measured the removal efficiency of runoff volume, suspended solids (SS), NO3--N, NH4+-N and TN in runoff and ground water. The results showed that, with increasing riparian vegetation strip width, the removal rate of runoff volume, SS, and nitrogen increased. A 5mwidth L. perenne strip reduced SS by 69.1%, while a 5mwidth A. fruticosa+L. perenne strip removed 57.6% of NO3--N in runoff. Vegetation strips with 13mwidth averagely reduced SS, NH4+-N, NO3--N and TN by 95.6%, 91.3%, 75.9%, and 82.9%, respectively. The removal rate of N in runoff was significantly lower than that in ground water. The removal rate of NO3--N and TN in ground water within 5mwidth vegetation strip recorded negative value, indicating that vegetation buffer strengthens infiltration of nonpoint source N and thus increases the risk of NO3--N loss in subsurface flow. Among the four types of vegetation buffers, A. fruticosa+L. perenne strip had the highest removal efficiency of N in runoff and ground water.
Key words: sodium nitroprusside, iron deficiency, tomato seedlings, antioxidant enzyme., NO3- stress, nutrients uptake
ZHANG Hong-ling, LI Tian-jiao, ZHAO Zhi-Fang, MA Guo-feng, CHEN Su, SUN Li-na. Effects of riparian vegetation buffers on the removal efficiency of suspended solids and nitrogen in Liaohe River protected area.[J]. cje.
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URL: http://www.cje.net.cn/EN/abstract/abstract20995.shtml
http://www.cje.net.cn/EN/Y2020/V39/I7/2185