不同人工草地对青藏高原温性草原群落生物量组成及物种多样性的影响

doi:10.11686/cyxb2019100

摘要/Abstract

摘要： 青藏高原天然草地生产力较低,草畜矛盾长期尖锐。人工草地逐渐在该区域发展,但不同种植模式人工草地的影响和应用适宜性尚未得到准确的量化评估。以青海省天然草地(NP)为对照,选取相互毗邻的3种不同人工草地:单播垂穗披碱草人工草地(A₁)、单播燕麦人工草地(A₂)和混播燕麦、青稞和油菜的人工草地(A₃)设置实验样地,通过群落调查、刈割称重、根钻采样等方法,测定分析4种群落物种组成、生物量及物种多样性,探讨燕麦和垂穗披碱草两种牧草及单播和混播两种种植方式的差异性影响。结果表明:3种不同人工草地均显著减少有毒植物生物量(P<0.05),显著提高优质牧草占比(P<0.05),改善牧草质量。A₂地上生物量最高(1263.21 g·m^-2),为NP的9.77倍,显著高于其他3种草地(P<0.05)。本研究草地地下生物量占比高(73.22%~95.79%),3种人工种草对地下生物量改变不显著,对总生物量的影响也不显著。A₂、A₃的物种组成与NP迥异,A₂的Pielou均匀度指数显著低于NP和A₃(P<0.05),A₃的Shannon-Wiener指数显著低于NP(P<0.05);而A₁的Gleason指数、Shannon-Wiener指数和Pielou均匀度指数均较高,与NP差异不显著。基于结果,认为相比于天然草地,单播燕麦人工草地可以获得更高的地上生物量,但强烈改变群落物种组成,降低群落物种多样性;而种植垂穗披碱草地上生物量增幅不显著,但其群落物种多样性、均匀度均较高,有利于群落在不利条件下维持相对稳定的生产力。

关键词: 人工草地, 生物量, 物种多样性, 温性草原

Abstract: The temperate steppe ecosystem on the Qinghai-Tibet Plateau has degenerated greatly in recent decades. Cultivating artificial grassland can alleviate the degradation of natural grassland and result in higher biomass yield. However, the influence and suitability of different species combinations when used to establish artificial grassland in this region remain unclear. Therefore, we selected one natural pasture (NP) as a comparison and three different adjacent artificial seeding regimes [Elymus nutans monoculture (A₁), oat monoculture (A₂) and oat-highland barley-oilseed rape mixed-culture (A₃)] to establish artificial grasslands for experimental comparison in temperate steppe of Guinan county, Qinghai Province. The research aim was to evaluate the influence that different forages (oat and E. nutans; A₁ and A₂) and sowing methods (monoculture or mixed-culture; A₂ and A₃) would have on herbage yield and vegetation community stability. Results were obtained by community investigation and sampling in each plot. In this study, the three artificial grasslands under agricultural management significantly decreased the biomass of poisonous plants (P<0.05), and also significantly improved the proportion of high-quality forage (P<0.05). A₂ provided the highest aboveground biomass (1263.21 g·m^-2) and was 9.77 times more productive than NP and significantly higher than the other three grasslands (P<0.05). The three artificial grasslands did not significantly change the belowground biomass or the total biomass, and no significant difference of these two indices was found among artificial grasslands. Artificial grasslands in this study changed the species composition, especially A₂ and A₃, which were quite different from NP. The Pielou evenness index of A₂ was significantly lower than NP and A₃ (P<0.05), while the Shannon-Wiener index of A₃ was significantly lower than NP (P<0.05). In contrast, A₁ had a high species diversity index, by various measures, including Gleason index, Shannon-Wiener index and Pielou evenness index, was similar to NP. Our results demonstrate that the oat monoculture grassland (A₂) changed the species composition of the NP temperate steppe vegetation community more strongly than other treatments and produced higher aboveground biomass in comparison to E. nutans grassland. By contrast, E. nutans grassland did not greatly improve aboveground biomass, but maintained community species diversity and evenness, which was conducive to retention of a relatively stable community productivity under harsh conditions.

Key words: artificial grassland, biomass, species diversity, temperate steppe

官惠玲, 樊江文, 李愈哲. 不同人工草地对青藏高原温性草原群落生物量组成及物种多样性的影响[J]. 草业学报, 2019, 28(9): 192-201.

GUAN Hui-ling, FAN Jiang-wen, LI Yu-zhe. The impact of different introduced artificial grassland species combinations on community biomass and species diversity in temperate steppe of the Qinghai-Tibetan Plateau[J]. Acta Prataculturae Sinica, 2019, 28(9): 192-201.

参考文献

[1] Xin Y C.The distribution characteristics of temperate grassland in Qinghai Province. Qinghai Prataculturae, 2014, 23(1): 35-42.
辛玉春. 青海省温性草原类草地的分布特征. 青海草业, 2014, 23(1): 35-42.
[2] Yan Y, Wan Z, Chao R, et al. A comprehensive appraisal of four kinds of forage under irrigation in Xilingol Inner Mongolia, China. The Rangeland Journal, 2018, 40(2): 171-178.
[3] Dendoncker N, Crouzat E.Can ecosystem services help the new agricultural transition? Sustainability Science. Routledge in Association with GSE Research, 2018, 169(182): 169-182.
[4] Yan H, Liu F, Liu J, et al. Status of land use intensity in China and its impacts on land carrying capacity. Journal of Geographical Sciences, 2017, 27(4): 387-402.
[5] Erb K H, Kastner T, Plutzar C, et al. Unexpectedly large impact of forest management and grazing on global vegetation biomass. Nature, 2018, 553: 73-76.
[6] Squiers V R, Dengler J, Hua L, et al.Grasslands of the world:Diversity, management and conservation. Boca Raton: CRC Press, 2018.
[7] Shen H H, Zhu Y K, Zhao X, et al. Analysis of current grassland resources in China. Chinese Science Bulletin, 2016, 61(2): 139-154.
沈海花, 朱言坤, 赵霞, 等. 中国草地资源的现状分析. 科学通报, 2016, 61(2): 139-154.
[8] Duo J C.The status of grass industry and its development in Guinan county of Qinghai Province. Animal Husbandry and Feed Science, 2010, 31(5): 31-33.
多杰措. 青海贵南县草产业现状及今后的发展思路. 畜牧与饲料科学, 2010, 31(5): 31-33.
[9] Wang B.Study on carbon flux and its controlling mechanisms in a degraded alpine meadow and an artificial pasture in the Three-River Source region of the Qinghai-Tibetan Plateau. Tianjin: Nankai University, 2014.
王斌. 三江源区退化和人工草地生态系统CO₂通量及其影响机制的研究. 天津: 南开大学, 2014.
[10] He H, Li H, Zhu J, et al. The asymptotic response of soil water holding capacity along restoration duration of artificial grasslands from degraded alpine meadows in the Three River Sources, Qinghai-Tibetan Plateau, China. Ecological Research, 2018, 33(5): 1001-1010.
[11] Lou Z S, Mao W Z, Liu Y H.0 ℃ critical temperature in alpine region of Qinghai during 1961-2017: Variation characteristics. Chinese Agricultural Science Bulletin, 2019, 35(11): 110-114.
娄仲山, 毛万珍, 刘运华. 1961—2017年高寒地区0 ℃界限温度变化特征. 中国农学通报, 2019, 35(11): 110-114.
[12] Zhong C, Jia S Y, Wei P, et al. A study of evolution characteristics of agricultural meteorological disasters in Guinan county. Ningxia Journal of Agriculture and Forestry Science and Technology, 2014, 55(12): 107-111, 113.
钟存, 贾生玉, 魏鹏, 等. 贵南县农业气象灾害演变特征研究. 宁夏农林科技, 2014, 55(12): 107-111, 113.
[13] La Y L.Basic characteristics of grassland types in Guinan county. Journal of Grassland and Forage Science, 2006, (11): 34-36.
拉元林. 贵南县草地类型的基本特征.草业与畜牧, 2006, (11): 34-36.
[14] Yu H L, Fan J W, Li Y Z, et al. Effects of Myospalax baileyi disturbance on plant community at alpine meadow in Three Rivers Headwater Region, China. Chinese Journal of Applied Ecology, 2018, 29(6): 1902-1910.
于海玲, 樊江文, 李愈哲, 等. 高原鼢鼠干扰对三江源区高寒草甸群落特征的影响. 应用生态学报, 2018, 29(6): 1902-1910.
[15] Li M C, Yi X F, Zhang X A, et al. The list of C₄ plants in alpine locality of Qinghai Plateau. Acta Botanica Boreali-Occidentalia Sinica, 2005, (5): 1046-1050.
李明财, 易现峰, 张晓爱, 等. 青海高原高寒地区C₄植物名录.西北植物学报, 2005, (5): 1046-1050.
[16] Atkinson R R L, Mockford E J, Bennett C, et al. C₄ photosynthesis boosts growth by altering physiology, allocation and size. Nature Plants, 2016, 2(5): 16038.
[17] Shi Z C.Main poisonous plants on the grassland of China. Beijing:China Agricultural Press, 1997.
史志诚.中国草地重要有毒植物. 北京:中国农业出版社 , 1997.
[18] Wang Q H, Li C, Pang Z, et al. Poisonous weeds in Chinese grassland and control technology. Acta Agrestia Sinica, 2013, 21(5): 831-841.
王庆海, 李翠, 庞卓, 等. 中国草地主要有毒植物及其防控技术. 草地学报, 2013, 21(5): 831-841.
[19] Tilman D, Downing J A.Biodiversity and stability in grasslands. Nature, 1994, 367: 363.
[20] Pu X P.Effect of nitrogen fertilization on oat and soil enzyme activity in alpine region. Lanzhou: Gansu Agricultural University, 2005.
蒲小鹏. 氮肥对高寒地区燕麦草地生产性能及土壤酶活性的影响. 兰州: 甘肃农业大学, 2005.
[21] Cabrera M, Guerrero V S, Duivenvoorden J F.Non-destructive allometric estimates of above-ground and below-ground biomass of high-mountain vegetation in the Andes. Applied vegetation science, 2018, 21(3): 477-487.
[22] Liu W H, Zhang Y J, Shi S L, et al. Effect of variety, fertilization and mixture sowing on oat biomass allocation in the alpine cultivated pasture. Journal of Plant Nutrition and Fertilizer, 2017, 23(2): 398-407.
刘文辉, 张英俊, 师尚礼, 等. 高寒地区燕麦(Avena sativa L.)人工草地生物量分配对施肥和混播措施的响应. 植物营养与肥料学报, 2017, 23(2): 398-407.
[23] Hou X K.Research on the features of soil and vegetation variation about different type of alpine cultivated grassland. Xining: Qinghai University, 2015.
候宪宽. 不同类型人工高寒草地的土壤和植被变化特征研究. 西宁: 青海大学, 2015.
[24] Diabate B, Wang X, Gao Y, et al. Tillage and haymaking practices speed up belowground net productivity restoration in the degraded Songnen grassland. Soil and Tillage Research, 2018, 175: 62-70.
[25] Li W, Wang J L, Zhang X J, et al. Effect of degradation and rebuilding of artificial grasslands on soil respiration and carbon and nitrogen pools on an alpine meadow of the Qinghai-Tibetan Plateau. Ecological Engineering, 2018, 111: 134-142.
[26] Liu W H, Liu Y, Ma X, et al. Effect of fertilizer and mixture on the oat cultivation grassland plant carbon storage on alpine plateau. Acta Ecologica Sinica, 2018, 26(5): 1150-1158.
刘文辉, 刘勇, 马祥, 等. 高寒区施肥和混播对燕麦人工草地生物碳储量影响的研究. 草地学报, 2018, 26(5): 1150-1158.
[27] Zhou H K, Zhao X Q, Zhao L, et al. The community characteristics and stability of the elymus nutans artificial grassland in alpine meadow. Chinese Journal of Grassland, 2007, (2): 13-25.
周华坤, 赵新全, 赵亮, 等. 高山草甸垂穗披碱草人工草地群落特征及稳定性研究. 中国草地学报, 2007, (2): 13-25.
[28] Zhang L, Wang C T, Liu W, et al. Relationships of dominant species root activity, plant community characteristics and soil micro-environment in artificial grassland over different cultivation periods. Acta Prataculturae Sinica, 2012, 21(5): 185-194.
张莉, 王长庭, 刘伟, 等. 不同建植期人工草地优势种植物根系活力、群落特征及其土壤环境的关系. 草业学报, 2012, 21(5): 185-194.
[29] Hou X K, Dong Q M, Shi J J, et al. Structural feature and biodiversity of plant community in the cultivated grassland of two seedling methods with the same planting fixed number of year. Acta Agrestia Sinica, 2014, 22(5): 961-965.
侯宪宽, 董全民, 施建军, 等. 相同建植年限2种类型人工草地群落结构及物种多样性研究. 草地学报, 2014, 22(5): 961-965.
[30] Li Y Y, Dong S K, Zhu L, et al. Adaptation strategies of reproduction of plant community in response to grassland degradation and artificial restoration. Acta Ecologica Sinica, 2013, 33(15): 4683-4691.
李媛媛, 董世魁, 朱磊, 等. 青藏高原高寒草甸退化与人工恢复过程中植物群落的繁殖适应对策. 生态学报, 2013, 33(15): 4683-4691.