采用凋落物分解袋法,对2种台湾桤木复合模式(A.台湾桤木-扁穗牛鞭草,B.台湾桤木-自然草)林地地上凋落物(叶、枝)、地下细根的分解及其养分释放动态进行了研究。结果表明:①经过1年的分解,凋落物叶分解最快,其次是细根(混合根),枝分解最慢,且3种凋落物干质量残留率均为A模式低于B模式,方差分析显示,扁穗牛鞭草的植入显著增加了凋落物枝和根的分解速率(P<0.05),而对凋落物叶分解速率影响不显著(P>0.05)。②凋落物初始木质素含量、m(C)/m(N)、m(木质素)/m(N)和m(木质素)/m(P)等与凋落物分解速率均呈显著的负相关关系(P<0.05,P<0.01); 除B模式细根外N含量均与凋落物分解速率存在显著正相关关系(P<0.05)。③在凋落物叶、枝、根分解过程中,C、K元素呈现净释放状态,N元素动态呈现富集—释放规律,而P元素在凋落物叶分解过程中呈现快速净释放过程; 扁穗牛鞭草的植入显著加快了3种凋落物中C(除凋落物叶)、N、P元素的释放(P<0.05)。
Abstract
Alnus formosana-Hemarthria compressa(model A)and A. formosana-natural weed(model B)were chosen as the experimental models in this study. The decomposition bags method was used to explore the characteristics of litter decomposition and dynamics of nutrient release under & over ground. The results were as follows:① Leaves decomposed more fast after one year, followed by fine roots(mixed roots), whereas, branches was the slowest. Moreover, there were significant differences in the dry quality retention rate of leaf, branch, and root(P<0.05), which were significantly lower in model A than that in model B. Results of ANOVA showed that planting H. compressa significantly increased decomposition rate of branches and roots(P<0.05), however, it did not significantly influence the decomposition rate of leaves(P>0.05). ② Original content of lignin, the ratio of m(C)to m(N), m(lignin)to m(N)and m(lignin)to m(P)were negatively correlated with dry litter quality retention rate(P<0.05, P<0.01), respectively. The contents of N were positively correlated with dry litter decomposition rate of those research objects(P<0.05)except fine roots in model B. ③ In process of decomposition of leaves, branches, and roots, C and K statuses were net release, and N status was enrichment-release, whereas, P status was net release rapidly in leaves decomposition. Thus, planting H. compressa significantly speed up the release of C(except leaves), N and P(P<0.05)in the leaves, branches, and roots.
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参考文献
[1] Chapin Ⅲ F S, Chapin M C, Matson P A, et al. Principles of terrestrial ecosystem ecology[M]: Berlin:Springer Verlag, 2002.
[2] 曲浩,赵学勇,赵哈林,等. 陆地生态系统凋落物分解研究进展[J]. 草业科学, 2010,27(8): 44-51. Qu H, Zhao X Y, Zhao H L, et al. Research progress of litter decomposition in terrestrial ecosystems[J]. Pratacultural Science, 2010,27(8):44-51.
[3] 荣丽,李贤伟,张健,等. 华西雨屏区不同退耕模式细根、草根分解及主要土壤微生物功能群动态[J]. 自然资源学报, 2009,24(6): 1069-1079. Rong L,Li X W,Zhang J,et al. Major microbial functional groups related to fine root and grass root decomposition in different models of conversion of farmland to forest in the rainy zone of west China[J]. Journal of Natural Resources, 2009,24(6):1069-1079.
[4] Gartner T B, Cardon Z G. Decomposition dynamics in mixed-species leaf litter[J]. Oikos, 2004, 104(2): 230-246.
[5] 李贤伟,张健,胡庭兴,等. 退耕还林理论基础及林草模式的实践应用[M]. 北京:科学出版社,2009. Li X W, Zhang J, Hu T X, et al. Theory of the conversion of farmland to forests and application of forest-grass mode[M].Beijing:Science Press,2009.
[6] 罗艺霖,陈栎霖,李贤伟,等. 台湾桤木林草复合生态系统土壤碳氮特征[J]. 四川农业大学学报, 2013,31(1): 15-19. Luo Y L, Chen Y L, Li X W, et al. Soil carbon and nitrogen properties in an Alnus formosana forest-grass complex ecosystem[J]. Journal of Sichuan Agricultural University, 2013,31(1):15-19.
[7] 王红柳,岳征文,卢欣石. 林草复合系统的生态学及经济学效益评价[J]. 草业科学, 2010,27(2): 24-27. Wang H L, Yue Z W, Lu X S. An analysis of economic benefit and social effect of Pi Teapple-alfalfa complex ecosystem[J]. Pratacultural Science, 2010,27(2):24-27.
[8] 王敬,李贤伟,张健,等. 台湾桤木与黑麦草复合模式细根和草根的分解及养分动态[J]. 南京林业大学学:自然科学版,2009,33(4): 67-71. Wang J,Li X W,Zhang J,et al. Fine root and grass root decomposition and nutrient dynamics in an intercropping system of Alnus formosana-Lolium multiflorum[J]. Journal of Nanjing Forestry University:Natural Sciences Edition, 2009,33(4):67-71.
[9] 范冰,李贤伟,张健,等. 退耕还林地三倍体毛白杨与黑麦草复合模式细根和草根的分解动态[J]. 林业科学, 2007,43(S1): 1-6. Fan B,Li X W, Zhang J, et al. Fine root and grass root decomposition in an intercropping system of Triploid Populus tomentosa and Lolium multiflorum established on land converting from farmland[J]. Scientia Silvae Sinicae, 2007,43(S1):1-6.
[10] 涂利华,胡庭兴,张健,等. 模拟氮沉降对两种竹林不同凋落物组分分解过程养分释放的影响[J]. 生态学报, 2011,31(6): 1547-1557. Tu L H, Hu T X, Zhang J,et al. Effect of simulated nitrogen deposition on nutrient release in decomposition of several litter fractions of two bamboo species[J]. Acta Ecologica Sinica, 2011,31(6):1547-1557.
[11] 杨玉盛,郭剑芬,陈银秀,等. 福建柏和杉木人工林凋落物分解及养分动态的比较[J]. 林业科学,2004,40(3): 19-25. Yang Y S, Guo J F, Chen Y X, et al. Comparative study on litter decomposition and nutrient dynamics between plantation of Fokienia hodginsii and Cunninghamia lanceolata[J]. Scientia Silvae Sinicae, 2004,40(3):19-25.
[12] Vorˇíková J, Baldrian P. Fungal community on decomposing leaf litter undergoes rapid successional changes[J]. The ISME Journal, 2012, 7(3): 477-486.
[13] 王海明,陈治谏,李贤伟. 不同退耕还林林草复合经营模式生物量和营养元素循环研究[J]. 水土保持研究,2005,12(2): 125-127. Wang H M, Chen Z J, Li X W.Study on biomass and nutrient content cycle of different forest and grass system in converting farm lands to forest and grass[J]. Soil and Water Conservation, 2005,12(2):125-127.
[14] 刘语欣. 台湾桤木与扁穗牛鞭草复合模式凋落物分解及土壤养分动态研究[D]. 成都:四川农业大学,2010. Liu Y X. Litter decomposition and nutrient dynamics on soil in complex ecosystem of Alnus formosana-Hamarthria compressa[J]. Scientia Silvae Sinicae, 2004,40(3):19-25.
[12] Vorˇíková J, Baldrian P. Fungal community on decomposing leaf litter undergoes rapid successional changes[J]. The ISME Journal, 2012, 7(3): 477-486.
[13] 王海明,陈治谏,李贤伟. 不同退耕还林林草复合经营模式生物量和营养元素循环研究[J]. 水土保持研究,2005,12(2): 125-127. Wang H M, Chen Z J, Li X W.Study on biomass and nutrient content cycle of different forest and grass system in converting farm lands to forest and grass[J]. Soil and Water Conservation, 2005,12(2):125-127.
[14] 刘语欣. 台湾桤木与扁穗牛鞭草复合模式凋落物分解及土壤养分动态研究[D]. 成都:四川农业大学,2010. Liu Y X. Litter decomposition and nutrient dynamics on soil in complex ecosystem of . Chengdu:Sichuan Agricultural University,2010.
[15] Parton W, Silver W L, Burke I C, et al. Global-scale similarities in nitrogen release patterns during long-term decomposition[J]. Science, 2007, 315(5810): 361-364.
[16] Ball B A, Bradford M A, Hunter M D. Nitrogen and phosphorus release from mixed litter layers is lower than predicted from single species decay[J]. Ecosystems, 2009, 12(1): 87-100.
基金
收稿日期:2013-12-20 修回日期:2014-03-16
基金项目:国家自然科学基金面上项目(30771717); “十二五”国家科技支撑计划(2011BAC09B05); 四川省科技支撑计划(2010NZ0049)
第一作者:陈栎霖,博士生,工程师。*通信作者:李贤伟,教授。E-mail:lxw@sicau.edu.cn。
引文格式:陈栎霖,刘语欣,范川,等. 台湾桤木-扁穗牛鞭草复合模式下凋落物分解及其养分释放动态[J]. 南京林业大学学报:自然科学版,2015,
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