水资源保护
水資源保護
수자원보호
WATER RESOURCES PROTECTION
2014年
4期
10-13
,共4页
活性氮%硝态氮异化还原成铵%河口地区%咸潮%氮素总量控制
活性氮%硝態氮異化還原成銨%河口地區%鹹潮%氮素總量控製
활성담%초태담이화환원성안%하구지구%함조%담소총량공제
active nitrogen%nitrate dissimilatory reduction to ammonium%estuarine region%salt tide%total nitrogen control
为了揭示水体特有的，具生物活性的氮素积累而造成水生态恶化的内因，对河口区氮循环的非传统生物转化途径，即硝态氮异化还原成铵（ DNRA ）的活性氮累积途径进行综合分析。河口环境特征与相应的微生物生态学研究表明：相对高温高盐的滨岸带系统里夏季富营养化严重，生物活性氮素通量高；在浅水河口的DNRA是氮转化客观存在的“链节”（相应地成为反硝化的汇）。高盐环境下的沉积物有充足的碳源，具备DNRA菌糖代谢发酵的条件，从而可能具备与反硝化过程竞争的环境条件。认为应结合河口特征如气候、盐度、微生物种类等对DNRA的关联机制展开深入细致的研究，为我国河口地区的氮素总量控制管理及富营养化水平评价提供生物学基础。
為瞭揭示水體特有的，具生物活性的氮素積纍而造成水生態噁化的內因，對河口區氮循環的非傳統生物轉化途徑，即硝態氮異化還原成銨（ DNRA ）的活性氮纍積途徑進行綜閤分析。河口環境特徵與相應的微生物生態學研究錶明：相對高溫高鹽的濱岸帶繫統裏夏季富營養化嚴重，生物活性氮素通量高；在淺水河口的DNRA是氮轉化客觀存在的“鏈節”（相應地成為反硝化的彙）。高鹽環境下的沉積物有充足的碳源，具備DNRA菌糖代謝髮酵的條件，從而可能具備與反硝化過程競爭的環境條件。認為應結閤河口特徵如氣候、鹽度、微生物種類等對DNRA的關聯機製展開深入細緻的研究，為我國河口地區的氮素總量控製管理及富營養化水平評價提供生物學基礎。
위료게시수체특유적，구생물활성적담소적루이조성수생태악화적내인，대하구구담순배적비전통생물전화도경，즉초태담이화환원성안（ DNRA ）적활성담루적도경진행종합분석。하구배경특정여상응적미생물생태학연구표명：상대고온고염적빈안대계통리하계부영양화엄중，생물활성담소통량고；재천수하구적DNRA시담전화객관존재적“련절”（상응지성위반초화적회）。고염배경하적침적물유충족적탄원，구비DNRA균당대사발효적조건，종이가능구비여반초화과정경쟁적배경조건。인위응결합하구특정여기후、염도、미생물충류등대DNRA적관련궤제전개심입세치적연구，위아국하구지구적담소총량공제관리급부영양화수평평개제공생물학기출。
In order to explore the internal causes of aquatic ecological deterioration by biological active nitrogen accumulation , which specifically occurs in water bodies , we comprehensively analyze the non-traditional biological conversion paths of nitrogen cycling , i.e., the paths of active nitrogen accumulation based on dissimilatory nitrate reduction to ammonium ( DNRA ) , in estuarine regions .Studies of estuarine environmental characteristics and microbial ecology show that there exist severe eutrophication and large fluxes of biological active nitrogen in the summer in the riparian zone , with relatively high temperature and salinity .DNRA in a shallow estuary is the chain unit for the occurrence of nitrogen conversion .The sediments in a high-salinity environment have sufficient carbon sources and can meet the requirements of DNRA carbohydrate metabolism fermentation .Thus, they may satisfy the conditions for competing with the denitrification process .We suggest that future studies should be focused on relationships between estuarine climate , salinity, microbe species, and DNRA.This study provides a biological basis for total nitrogen control and eutrophic status evaluation in estuarine regions of China .
