Quantification of dissolved organic carbon (DOC) storage in lakes and reservoirs of mainland China.
Quantification of dissolved organic carbon (DOC) storage in lakes and reservoirs of mainland China.
复制标题
DOI：
10.1016/j.jenvman.2018.03.121
复制
发表时间：
2018-07
影响因子：
8.7
通讯作者：
K. Song;Z. Wen;Y. Shang;Hong Yang;L. Lyu;Ge Liu;C. Fang;Jia Du;Ying Zhao
中科院分区：
文献类型：
--
作者：
K. Song;Z. Wen;Y. Shang;Hong Yang;L. Lyu;Ge Liu;C. Fang;Jia Du;Ying Zhao
溶解有机碳(DOC)作为内陆水域碳的主要组成部分，在全球范围内的碳循环中起着至关重要的作用。然而，到目前为止，湖泊和水库中储存的DOC数量尚不清楚。为了检验决定中国地区湖泊和水库DOC储量的因素，我们收集了一个大型数据库(测量了367个湖泊，对来自5个淡水区的102个湖泊进行了荟萃分析；测量了144个水库，对31个省级单位的272个水库进行了荟萃分析)，并建立了一个用于确定静态内陆水域DOC储量的湖泊和水库的蓄水量。结果表明，咸水( ± S.D：50.5/30.0 ± 55.97 mg/L)远高于淡水(8.1/5.9 ± 6.8 mg/L)，湖泊DOC(2 5.9/11.5 ± 42.04 mg/L)明显高于水库(5.0/3.8 ± 4.5 mg/L)。从湖泊水量和溶解有机碳储量来看，青藏高原湖区的湖泊水量最大(552.8 km~3)，其中92%为咸水，其中最大的溶解有机碳(13.39 Tg)储存在这些高山湖区；其次是蒙新湖地区，水量为99.4 km~3，其中储存了1.75 Tg溶解有机碳。与蒙新湖地区相比，东中国湖区的蓄水量(91.9km3)与蒙新湖地区相当，但由于DOC浓度较低(AVE：3.45 ±2.68 mg/L)，该地区的DOC量(0.43kg.tg)要小得多。根据我们的调查，云贵和东北湖区的蓄水量分别为32.14km3和19.44km3，但云贵的DOC量(0.13 Tg)比东北湖区(0.19 Tg)的库容相对要少。由于水库中DOC浓度较低，特别是大型水库的DOC浓度较低(V >； 1.0 km~3：2.31 ± 1.48 mg/L)，全国各地水库在485.1 km~3的容量中仅储存了1.54 Tg。
As a major fraction of carbon in inland waters, dissolved organic carbon (DOC) plays a crucial role in carbon cycling on a global scale. However, the quantity of DOC stored in lakes and reservoirs was not clear to date. In an attempt to examine the factors that determine the DOC storage in lakes and reservoirs across China, we assembled a large database (measured 367 lakes, and meta-analyzed 102 lakes from five limnetic regions; measured 144 reservoirs, and meta-analyzed 272 reservoirs from 31 provincial units) of DOC concentrations and water storages for lakes and reservoirs that are used to determine DOC storage in static inland waters. We found that DOC concentrations in saline waters (Mean/median ± S.D: 50.5/30.0 ± 55.97 mg/L) are much higher than those in fresh waters (8.1/5.9 ± 6.8 mg/L), while lake DOC concentrations (25.9/11.5 ± 42.04 mg/L) are much higher than those in reservoirs (5.0/3.8 ± 4.5 mg/L). In terms of lake water volume and DOC storage, the Tibet-Qinghai lake region has the largest water volume (552.8 km3), 92% of which is saline waters, thus the largest DOC (13.39 Tg) is stored in these alpine lake region; followed by the Mengxin lake region, having a water volume of 99.4 km3in which 1.75 Tg DOC was stored. Compared to Mengxin lake region, almost the same amount of water was stored in East China lake region (91.9 km3), however, much less DOC was stored in this region (0.43 Tg) due to the lower DOC concentration (Ave: 3.45 ± 2.68 mg/L). According to our investigation, Yungui and Northeast lake regions had water storages of 32.14 km3and 19.44 km3respectively, but relatively less DOC was stored in Yungui (0.13 Tg) than in Northeast lake region (0.19 Tg). Due to low DOC concentration in reservoirs, especially these large reservoirs having lower DOC concentration (V > 1.0 km3: 2.31 ± 1.48 mg/L), only 1.54 Tg was stored in a 485.1 km3volume of water contained in reservoirs across the entire country.