Preliminary study on the biomass and the carbon storage in karst grassland in Liujiang Basin, Guangxi
-
摘要: 根据柳江流域草丛群落类型、高度及其分布面积选择平均高度>1.5m、0.5~1m和<0.5m的高、中、低3种高度的代表性草丛,通过收获法研究了其群落生物量,并对其碳储量进行了初步估算。研究结果表明:(1)五节芒(Miscanthusflorid-ulus)、毛秆野古草(Arundinellahirta)和假俭草(Eremochloaophiuroides)草丛群落的生物量分别为8609.68g/m2、1022.61g/m2和821.63g/m2,生物量与高度呈正相关,但随群落高度增加,地上生物量增加迅速,地下生物量增长平缓;(2)随群落高度增加,生物量迅速向地上部分聚集,低矮的假俭草群落地下生物量与地上生物量的比值为1.91,高度中等的毛秆野古草群落为1.32,但高度大的五节芒群落仅为0.21,地下/地上生物量比值与群落高度呈负相关,其中毛秆野古草与五节芒群落的地下生物量和地上生物量可以用幂函数很好的拟合(R2>0.79,P<0.01),因此二者可以依据地上生物量便捷的估算其地下生物量,但假俭草地下和地上生物量的关系模型不理想;(3)地下生物量以幂函数关系随深度递减(R2>0.95,P<0.01),主要集中分布在0~20cm土层,可达根系生物量的80%以上,40cm以下土层中根系很少;(4)柳江流域岩溶区草丛植被的碳储量达9.51TgC。Abstract: Grassland is one of the largest terrestrial ecosystem types and plays an important role in the global carbon cycle. Studies on biomass of karst grassland are rare that making the estimation on carbon storage inaccuracy because of lack of data. According to the average height and distribution areas, three representative karst grassland types in Liujiang Basin are chosen to estimate community biomass by harvest method. The results show that (1) total biomass of Miscanthus floridulus, Arundinella hirta and Eremochloa ophiuroides is 8 609.68 g/m2, 1 022.61 g/m2 and 821.63 g/m2 respectively. Biomass and height are positively correlated, while above-ground biomass increases faster than the below-ground one; (2) the relation of below-ground biomass to above-ground biomass varies from 0.21 for Miscanthus floridulus to 1.91 for Eremochloa ophiuroides, and shows a negatively correlation with community height. The ratio of below-ground biomass (y) and above-ground biomass (x) is well fit with power functions of y=1.7352x0.9062 for Arundinella hirta and y=5.3076x0.4466 for Miscanthus floridulus (R2> 0.79, P <0.01). Above-ground biomass accumulates rapidly with the increase of community height; (3) below-ground biomass decrease with depth and is well fit with power function model (R2＞ 0.95, P ＜0.01). Most of below-ground biomass distributes in 0～20cm soil layers; (4) the carbon storage of grassland in Liujiang Basin is calculated as 9.51 TgC.
-
Key words:
- karst area /
- grassland community /
- biomass /
- carbon storage /
- Liujiang Basin, Guangxi
-
[1] Scurlock, J M O and Hall D O. The global carbon sink: a grassland perspective［J］. Global Change Biology, 1998, 4(2): 229-233. [2] Fan, J, H Zhong, W Harris et al. Carbon storage in the grasslands of China based on field measurements of above-and below-ground biomass［J］. Climatic Change, 2008, 86(3): 375-396. [3] 杨福囤,王启基,史顺海.青海海北地区矮嵩草草甸生物量和能量的分配［J］.植物生态学报,1987,11(2):106-112. [4] 朱志诚,贾东林.陕北黄土高原黄背草群落生物量初步研究［J］.生态学报,1991,11(2):117-124. [5] Ni, J. Estimating net primary productivity of grasslands from field biomass measurements in temperate northern China［J］. Plant Ecology, 2004, 174(2): 217-234. [6] 黄玫,季劲钧,曹明奎,等.中国区域植被地上与地下生物量模拟［J］.生态学报,2006,26(12):4156-4163. [7] 陈佐忠,汪诗平.中国典型草原生态系统［M］,北京:科学出版社,2000. [8] 李博.我国草地生态研究的成就与展望［J］.生态学杂志,1992,11(3):1-7. [9] 方精云,郭兆迪,朴世龙,等.1981-2000年中国陆地植被碳汇的估算［J］.中国科学:D辑,2007,37(6):804-812. [10] 朴世龙,方精云,贺金生,等.中国草地植被生物量及其空间分布格局［J］.植物生态学报,2004,28(4):491-498. [11] 管东生.香港鸭嘴草+野古草+金茅群落的生物量和第一性生产力［J］.生态学杂志,1997,16(6):23-27. [12] 干友民,蒲朝龙,周寿荣,等.亚热带山地草地草群地上部现存量及生长量逐月动态的测定［J］.中国草地,1989,11(6):32-35. [13] 曾宪录,廖富林,温冠儒,等.梅州地区主要能源草分布及生长情况调查［J］.广东农业科学,2008,(7):25-28. [14] 杜有新,潘根兴,李恋卿,等.黔中喀斯特山区退化生态系统生物量结构与N,P分布格局及其循环特征［J］.生态学报,2010,30(23):6338-6347. [15] 罗东辉,夏婧,袁婧薇,等.我国西南山地喀斯特植被的根系生物量初探［J］.植物生态学报,2010,34(5):611-618. [16] 曹建华,袁道先,裴建国,等.受地质条件制约的中国西南岩溶生态系统［M］.北京:地质出版社,2005. [17] Tucker, C J, C L Vanpraet, M J Sharman et al. Satellite remote sensing of total herbaceous biomass production in the Senegalese Sahel: 1980-1984［J］. Remote Sensing of Environment, 1985, 17(3): 233-249. [18] 李凤秀,张柏,刘殿伟,等.洪河自然保护区乌拉苔草生物量高光谱遥感估算模型［J］.湿地科学,2008,5(1):51-59. [19] 朱桂林,韦文珊,张淑敏,等.植物地下生物量测定方法概述及新技术介绍［J］.中国草地学报,2008,30(3):94-99. [20] 胡中民,樊江文,钟华平,等.中国草地地下生物量研究进展［J］.生态学杂志,2005,24(9):1095-1101. [21] 赵慧颖.内蒙古东北部天然牧草生物量与气候条件的定量关系［J］.草业科学,2007,24(3):8-11. [22] 王萍,王斌,周天.土壤因素对羊草群落构成与种群生物量的影响［J］.东北师大学报(自然科学版),1997,29(1):89-93. [23] 马文红,方精云,杨元合,等.中国北方草地生物量动态及其与气候因子的关系［J］.中国科学:生命科学,2010,40(7):632-641. [24] 刘长利,王文全,崔俊茹,等.干旱胁迫对甘草光合特性与生物量分配的影响［J］.中国沙漠,2006,26(1):142-145. -
点击查看大图
计量
- 文章访问数: 2238
- HTML浏览量: 405
- PDF下载量: 1286
- 被引次数: 0
下载:
