Abstract：[Background] The soil nitrogen mineralization is controlled by various factors, including environmental factors, soil properties and plant residue qualities, etc. The objectives of our study are to clarify the soil mineralization characterization in typical vegetation community of riparian buffer strip in the Danjiangkou Reservoir, and to understand the correlation between plant chemical properties and soil nitrogen mineralization. [Methods] The soil used in experiment was collected from the upper 10 cm of the riparian buffer strips at 20 m interval. The leaves and roots of two typical plant species (Abutilon theophrasti Medicus and Cnidium monnier L. Cuss) from riparian buffer strips were collected, dried, cleaned, and ground for the incubation experiment and chemical analysis. Soil, ground leaves and roots were mixed as 9 treatments of control (CK without any plants added), single A. theophrasti leaf (QL) and single C. monnier leaf (SL), single A. theophrasti root (QR) and single C. monnier root (SR), mixed leaf and/or root (QL+SL, QL+SR, QR+SL, and QR+SR) for the laboratory incubation experiment. The soil mineralization rates were measured after 1, 3, 7, 14, 21, 31, 41, 51 and 61 day(s) of incubation. [Results] 1) There were 3 stages on soil mineralization after adding plants: the first stage (day 1-7) in which the rates of nitrogen mineralization declined, the second stage (day 7-41) in which the rates of nitrogen mineralization increased remarkably, and the last stage (day 41-61) in which the rates of nitrogen mineralization stayed in steady. The rates of soil mineralization in all treatments were less than that in the control (CK) of 79.53 mg/kg, the one with only A. theophrasti leaf (QL) was the highest with 71.62 mg/kg among single treatments, while the mixed treatment with the A. theophrasti leaf+C. monnier root treatment (QL+SR) resulted in the highest mineralization rate of 26.43 mg·kg-1 among the mixed treatments. 2) The content of soil microbial biomass increased significantly after adding plant residues (P < 0.05) as the order in: QL>all 4 mixed treatments>other 3 single treatments (except QL). 3) A significant correlation (P < 0.05) presented between soil N mineralization and the contents of total carbon and total nitrogen of plants during the whole experiment. The Principal Component Analysis (PCA) showed that the plant nitrogen content possessed the largest proportion in all factors, the significance was followed as: N> C:N> Cellulose> L:N> Polyphenols. 4) All the measured N mineralization rates were significantly less than the predicted values (P < 0.01). [Conclusions] These results indicated that added plants restrained the soil nitrogen mineralization, and mixed treatments of root and leaf did not promote combined effect. This study may provide a reference basis for the regional restoration of vegetation, soil and water conservation, and the pollution control of non-point resources.
张广分. 潮白河上游河岸植被缓冲带对氮、磷去除效果研究[J]. 中国农学通报, 2013, 29(8): 189. ZHANG Guangfen. The effects of riparian vegetation buffer zones on nitrogen and phosphorus reduction in Caobai River upstream[J]. Chinese Agricultural Science Bulletin, 2013, 29(8): 189.
[2]
饶良懿,崔建国. 河岸植被缓冲带生态水文功能研究进展[J]. 中国水土保持科学, 2008, 06(4): 121. RAO Liangyi, CUI Jianguo. Research advances on the eco-hydrological functions of riparian buffer[J]. Science of Soil and Water Conservation, 2008, 06(4): 121.
[3]
王相娥,薛立,谢腾芳. 凋落物分解研究综述[J]. 土壤通报, 2009, 40(6):1473. WANG Xiange, XUE Li, XIE Tengfang.A review on litter decomposition[J]. Chinese Journal of Soil Science, 2009, 40(6):1473.
[4]
李贵才, 韩兴国, 黄建辉,等. 森林生态系统土壤氮矿化影响因素研究进展[J]. 生态学报, 2001, 21(7): 1187. LI Guicai, HAN Xingguo, HUANG Jianhui, et al. A review of affecting factors of soil nitrogen mineralization in forest ecosystems[J]. Acta Ecologica Sinica, 2001, 21(7): 1187.
[5]
MYLLIEMNGAP W, NASH D, BARIK S K. Changes in vegetation and nitrogen mineralization during recovery of a montane subtropical broadleaved forest in North-eastern India following anthropogenic disturbance[J]. Ecological Research, 2016, 31(1): 21.
[6]
BONITO G M ,COLEMAN D C, HAINES B L, et al.. Can nitrogen budgets explain differences in soil nitrogen mineralization rates of forest stands along an elevation gradient? [J]. Forest Ecology &.Managemen, 2002, 176 (1/2/3): 563.
[7]
ZAMAN M, CHANG S X. Substrate type, temperature, and moisture content affect gross and net N mineralization and nitrification rates in agroforestry system[J]. Biology & Fertility of Soils, 2004, 39(4): 269.
[8]
VAN DERKRIFT T A J, BERENDSE F. The effects of plant species on soil nitrogen mineralization[J]. Journal of Ecology, 2001, 89(4): 555.
[9]
胡亚林, 汪思龙, 黄宇,等. 凋落物化学组成对土壤微生物学性状及土壤酶活性的影响[J]. 生态学报, 2005, 25(10): 2662. HU Yalin, WANG Silong, HUANG Yu, et al. Effects of litter chemistry on soil biological property and enzymatic activity[J]. Acta Ecologica Sinica, 2005, 25 (10): 2662.
[10]
林开敏, 章志琴, 曹光球,等. 杉木与楠木叶凋落物混合分解及其养分动态[J]. 生态学报, 2006, 26(8): 2732. LIN Kaimin, ZHANG Zhiqi, CAO Guangqiu, et al. Decomposition characteristics and its nutrient dynamics of leaf litter mixtures of both Chinese fir and Phoeba bournei[J]. Acta Ecologica Sinica, 2006, 26(8): 2732.
[11]
ROBERTS B A, FRITSCHI F B, HORWATH W R, et al. Nitrogen mineralization potential as influenced by microbial biomass, cotton residues and temperature[J]. Journal of Plant Nutrition, 2015, 38(3): 311.
[12]
ZENG Dehui, MAO Rong, CHANG S X, et al. Carbon mineralization of tree leaf litter and crop residues from poplar-based agroforestry systems in Northeast China: a laboratory study[J]. Applied soil ecology, 2010, 44(2): 133.
[13]
ROSTAMI A, GHOLAMALIZADEH A. Influence of conventional and conservation tillage on C and N mineralization in soil. A Rexiew[J]. International Journal of Plant, Animal and Environmental Sciences, 2014, 4(3): 276.
[14]
叶回春,张世文,黄元仿,等. 北京延庆盆地农田表层土壤肥力评价及其空间变异[J]. 中国农业科学, 2013, 46(15): 3151. YE Huichun, ZHANG Shiwen, HUANG Yuanfang, et al. Assessment of surface soil fertility and its spatial variability in Yanqing Basin, Beijing, China[J]. Scientia Agricultura Sinica, 2013, 46(15): 3151.
[15]
O'CONNELL S, SHI W, GROSSMAN J M, et al. Short-term nitrogen mineralization from warm-season cover crops in organic farming systems[J]. Plant Soil, 2015, 396(1): 353.
[16]
TAYLOR B R, PARKINSON D, PARSONS W F J. Nitrogen and lignin content as predictor of litter decay rates: a microcosm test[J]. Ecology, 1989, 70(1): 97.
[17]
XU Xiaoniu, HIRATA E. Decomposition patterns of leaf litter of seven common canopy species in a subtropical forest: N and P dynamics[J]. Plant and Soil, 2005, 273(1): 279.
[18]
BERG B, MARZNER E. Effect of N deposition on decomposition of plant litter and soil organic matter in forest systems[J]. Environmental Reviews, 2000, 5(1): 1.
[19]
FINZI A C, CANHAM C D. Non-additive effects of litter mixture on net N mineralization in a southern New England forest[J]. Forest Ecology &.Management, 1998, 105(1/2/3): 129.
[20]
赵满兴, KARSTEN K,周建斌. 黄土区几种土壤培养过程中可溶性有机氮的变化及其与土壤矿化氮的关系[J]. 水土保持学报, 2008, 22(4): 122. ZHAO Manxing, KARSTEN K, ZHOU Jianbin. Dynamics of soluble organic nitrogen and its relation to mineralization of soil organic nitrogen during incubation of several soils in the Loess Region[J]. Journal of Soil and Water Conservation, 2008, 22(4): 122.
[21]
许晓静,张凯,刘波,等. 森林凋落物分解研究进展[J]. 中国水土保持科学, 2007, 5(4): 108. XU Xiaojing, ZHANG Kai, LIU Bo, et al. Review on litter decomposition in forest ecosystems[J]. Science of Soil and Water Conservation, 2007, 5(4): 108.
[22]
GARTNER T B, CARDON Z G. Decomposition dynamics in mixed-species leaf litter[J]. Oikos, 2004, 104(2): 230.
[23]
HECTOR A, BEALE A, MINNS et al. Consequences of the reduction of plant diversity for litter decomposition: effects through litter quality and microenvironment[J]. Oikos, 2000, 90(2): 357.
[24]
BAI Junhong, GAO Haifeng, XIAO Rong, et al. A review of soil nitrogen mineralization as affected by water and salt in coastal wetlands: issues and methods[J]. Clean-Soil, Air, Water, 2012, 40(10): 1099.
[25]
DESSUREAULT-ROMPRE J, ZEBARTH B J, GEORGALLAS A, et al. A biophysical water function to predict the response of soil nitrogen mineralization to soil water content[J]. Geoderma, 2011, 167/168(8): 214.
2017, Vol. 15 
