DIFFERENTIAL EFFECTS OF GRAZING ON PLANT FUNCTIONAL TRAITS IN THE DESERT GRASSLAND
DIFFERENTIAL EFFECTS OF GRAZING ON PLANT FUNCTIONAL TRAITS IN THE DESERT GRASSLAND
复制标题
荒漠草原放牧对植物功能性状的差异性影响
DOI：
10.3161/104.062.0205
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发表时间：
2014-01-01
影响因子：
0.5
通讯作者：
Li, Guoqi
中科院分区：
文献类型：
--
作者：
An, Hui;Li, Guoqi
植物功能性状是植物对环境的响应和适应，与环境因子、个体和生态系统的结构和功能密切相关。在这里，整株植物的特征（株高和植物生物量）、叶形态（叶面积、叶干重和比叶面积）和化学性状6种优势种叶片碳、氮、磷含量、C/N和NIP比（牛心朴子，大戟，乌拉尔甘草菲施，胡枝子，在我国荒漠草原上对蒙古冰草（Agropyron mongolicum Keng）和短花针茅（Stipa breviflora Griseb）进行了4种放牧强度（0.00、0.45、1.00、1.50羊/ha）的放牧试验。放牧对6种优势种的叶片形态性状影响均达显著水平，对全株性状影响达极显著水平。breviflora，短花草A. mongolicum，蒙古棉G. uralensis，L. potaninii和C. komarovii。6种中有3种（S. breviflora，短花草A. mongolicum和L. potaninii）的株高（PH）随放牧强度的增加而降低，而比叶面积（SLA）和叶氮（N-mass）则表现出相反的趋势。全株性状与叶片干重呈显著正相关，与叶片氮、磷含量呈显著负相关。主成分分析的第一轴对应于植株大小（PH和PB）和叶片大小（LA和LM），第二轴对应于叶片化学性状（N质量、P、C和NIP）。放牧对植物性状的影响主要表现在植物的大小性状和化学性状上。功能性状不能作为预测植物种对放牧响应的唯一依据，还需要对植物性状之间的权衡进行功能分析。
Plant functional traits are linked with environmental factors, individuals and ecosystem structure and functions as plants respond and adapt to the environment. Here, the whole-plant traits (plant height and plant biomass), leaf morphological (leaf area, leaf dry mass and specific leaf area) and chemical traits (leaf carbon, nitrogen, phosphorus contents, C/N and NIP ratio) of six dominant species (Cynanchum komarovii Al, Euphorbia esula Linn, Glycyrrhiza uralensis Fisch, Lespedeza potaninii Vass, Agropyron mongolicum Keng and Stipa breviflora Griseb) were studied in the desert grassland of China, with a grazing experiment including four grazing intensity (0.00, 0.45, 1.00, 1.50 sheep ha(-1)). The effect of grazing on leaf morphological traits were significant for the six dominant species, while the effects on whole-plant traits were highly significant for S. breviflora, A. mongolicum, G. uralensis, L. potaninii and C. komarovii. Three of the six species (S. breviflora, A. mongolicum and L. potaninii) decreased in plant height (PH) with increasing grazing intensity, while specific leaf area (SLA) and leaf N (N-mass) showed the opposite trend. The whole-plant traits were significantly positively correlated with leaf dry mass (LM), but significantly negatively correlated with leaf nitrogen and phosphorus contents. The first principal component analysis (PCA) axis corresponding to plant size (PH and PB) and leaf size (LA and LM), while the second axis of PCA to leaf chemical traits (N-mass, P, C and NIP). Variations of plant traits in response to grazing were mainly explained by size trait and chemical traits. The functional traits cannot be the only basis for predicting plant species in response to grazing, and a functional analysis of the trade-off between plant traits is also needed.