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Connecting land use-land cover and precipitation with organic matter biogeochemistry in a tropical river-estuary system of western peninsular India.
Journal of Environmental Management ( IF 8.7 ) Pub Date : 2020-07-03 , DOI: 10.1016/j.jenvman.2020.110993
U K Pradhan 1 , Y Wu 2 , P V Shirodkar 3 , H Shiva Kumar 4 , J Zhang 2
Affiliation  

Organic matter (OM) composition changed due to land use ─ land cover (LULC) and hydrology modification, has distinctive linkage towards sustainable environment management in tropical river systems. It is crucial in small river systems, which experience delay of freshwater flow to the estuaries due to headwater damming, also LULC alteration along the entire basin. In order to understand this fundamental linkage in tropical Zuari river-estuary (ZRE), we analyzed multi-proxy data of organic carbon to total nitrogen ratio (Corg/N), stable organic carbon isotope (δ13Corg) and lignin phenols measured in seasonally collected suspended particulate matter (SPM) and sediment samples. Results highlighted about moderate seasonality of OM tracers, with a significant effect of LULC alteration, which nevertheless a striking feature in monsoon-fed river-estuaries of peninsular India. Particulate Corg export from ZRE estimated to be 20 × 103 kg yr−1, was much lower as compared to tropical river-estuary systems elsewhere. OM fraction from vascular plant (mangroves) contributed to SPM and sediment was 15% and 40%, respectively, calculated using a Bayesian mixing calculation through Stable isotope analysis in R (SIAR). Presence of mudflat LULC in the estuarine region notably caused 20% decrease in Corg and 60% increase in lignin phenol (Λ8) as compared to their limits in upstream. This is although mudflat accounts only 3% of ZRE catchment. The degree of shifts in OM tracers highlights towards efficient entrapment, transformation and/or utilization of riverine OM in the mudflats of ZRE. Accelerated human induced LULC dampens the seasonality of OM characteristics and flow is highlighted through this study, which is essential towards sustainable environmental management practice in small rivers of India and World.



中文翻译:

印度西部半岛热带河流河口系统中的土地利用土地覆盖和降水与有机物生物地球化学的联系。

由于土地利用而改变的有机物(OM)组成─土地覆盖(LULC)和水文学修改,与热带河流系统中的可持续环境管理有着独特的联系。这在小型河流系统中至关重要,由于上游水坝的阻塞以及整个流域的LULC改变,小型河流系统会延迟淡水流入河口。为了理解在热带祖阿里河-河口(ZRE)这一基本联动,我们分析了有机碳的多代理数据与总氮比率(C有机/ N)的,稳定的有机碳同位素(δ 13 C ^有机)和在季节性收集的悬浮颗粒物(SPM)和沉积物样品中测得的木质素酚。结果突出显示了OM示踪剂的适度季节性,具有LULC改变的显着效果,但在印度半岛季风喂养的河口中却具有显着特征。与其他地方的热带河口系统相比,ZRE的颗粒状C org出口估计为20×10 3  kg yr -1。维管束植物(红树林)的OM组分对SPM和沉积物的贡献分别为15%和40%,使用贝叶斯混合计算通过R中的稳定同位素分析(SIAR)进行计算。在河口区域滩涂LULC的存在特别是导致C的20%的减少的有机萃木质素苯酚(Λ8)与上游的限量相比增加了60%。尽管泥滩仅占ZRE集水量的3%。OM示踪剂的移动程度突出显示了ZRE泥滩中有效捕集,转化和/或利用河流OM。加速的人为诱导的LULC抑制了OM特征的季节性,并且通过本研究突出了流量,这对于印度和世界小河的可持续环境管理实践至关重要。

更新日期:2020-07-05
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