Seasonal dynamics of dissolved organic matter contents in surface soils of 3 artificial forests
KONG Yuhua, HAN Mengjuan, ZHANG Zhihua, XU Xingkai, LAI Yong, YANG Xitian
1. College of Forestry, Henan Agricultural University, 450002, Zhengzhou, China;
2. State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, 810016, Xining, China;
3. State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, 100029, Beijing, China;
4. College of Earth Science, University of Chinese Academy of Sciences, 100049, Beijing, China
Abstract：[Background] Soil active carbon and nitrogen are the most important and active components during soil carbon and nitrogen cycling, and their seasonal changes are of great significance to carbon and nitrogen cycling and redistribution within and between different ecosystems, as well as soil formation. To reveal soil carbon and nitrogen turnover mechanism in artificial forest ecosystem, seasonal dynamics of soil active carbon and nitrogen contents and other factors were determined.[Methods] Three typical artificial forests (Platycladus orientalis, Robinia pseudoacacia and Quercus variabilis) in the rocky mountainous area of northern China were selected as the research objects. Two treatments were set up, i.e., Y (with litter return) and W (without litter return). The characteristics and variation trends of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) and inorganic nitrogen (SIN, including NO3--N and NH4+-N) contents at the depth of 0-10 cm soils were investigated during March, June, September and December.[Results] The DOC, DON, NO3--N and NH4+-N contents in the 3 artificial forests soils all showed general significant seasonal dynamics (P<0.05), with peak values in June. NO3--N was the main form of inorganic nitrogen in soils, and its ratio to SIN in P. orientalis, R. pseudoacacia and Q. variabilis artificial forests were 70.2%, 72.8% and 53.4%, respectively. Artificial forest types had a significant impact on soil DOC and NO3--N contents (P<0.05). The annual average of soil DOC and DON contents with litter return presented as P. orientalis > Q. variabilis > R. pseudoacacia, while soil NO3--N, NH4+-N and SIN contents tended to be as P. orientalis > R. pseudoacacia > Q. variabilis. Litter treatments had a significant impact on soil DOC and DON contents (P<0.05), while no significant impact on soil NO3--N and NH4+-N contents. Further, most of forests soil without litter return showed higher DOC and DON concentrations than those of with litter return. A stepwise regression analysis showed that the main influencing factor of soil DOC in all treatments was soil total nitrogen (TN), which explained 76.4% of its variation. The main influencing factors for soil DON were soil TN, NO3--N, air temperature and NH4+-N, which together explained 86.6% of its variation.[Conclusions] Different artificial forest types significantly affected the seasonal variation of soil active carbon and nitrogen. Litter returns increased soil carbon and nitrogen content and turnover rate. Further, temperature was the main driving factor for soil active carbon and nitrogen turnover in the rocky mountainous areas of North China. Besides, soil DOC and DON turnover were mainly affected by soil TN content in the present artificial forest ecosystem.
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2019, Vol. 17 
