东江水库碳汇渔业与生态保护的初步研究

2007年7月和10月对东江水库的水体初级生产力和水质进行了监测和评价,估算了天然渔业资源量及可移出碳量。研究表明,库区存在较丰富的外源性营养物质,主要来源于农业、生活废水及旅游业;10月水体水质优于7月,均属中营养水平;初级生产力平均为5.13g/(m2.d),与水体叶绿素、氨氮和总磷浓度呈较强的正相关;折算滤食性鱼产量为1541.9t/年,移出碳量为218.4t/年。2007-2010年进行鱼类增殖放流,获得天然滤食性渔获物最高达产量为900t/年,移出碳量127.5t/年。在制订东江水库渔业环境保护条例时,按初级生产力的大小,利用增殖放流等渔业去碳技术,适量投放滤食性鱼类,充分利用水体氮、磷,可实现东江水库碳汇渔业的可持续发展。

Preliminary Studies on Carbon Sinking Fisheries and Ecological Protection in Dongjiang Reservoir

Estimating the catches of natural fisheries resources and the amount of possible remove carbon sinking after investigation on ambient of Dongjiang Reservoir and monitoring & evaluating the primary productivity and water quality. Results show that abundant exogenous nutrient substances exist around the reservoir mainly from agriculture, domestic wastewater and tourism; the water quality in Oct. was better than its in Jul., and also belong to middle nutritional level; the mean primary productivity was 5.16 gO2/m2•d and equal to the filter-feeding fish catches 1164.30T/y that probably could remove total carbon 41.35T/y.The primary productivity was in strong positive correlation with Chlorophyll-a, ammonia nitrogen and total phosphorus concentration. Fish was released from 2007 to 2010, and the annual highest yield of filter-feeding fish was 900T which equal to 32T carbon. N, P could be taken advantages of and reaching the purpose of sustainable development of carbon sinking fisheries through estimating the primary productivity and using the sinking carbon technology such as releasing filter-feeding fish for multiplication under making the regulation of protecting fisheries environment in Dongjiang Reservoir.