草业学报 ›› 2023, Vol. 32 ›› Issue (12): 68-76.DOI: 10.11686/cyxb2023067
吴金蕊1,2(), 李梦真1,2, 杨勇3,4, 刘爱军3,4, 王普昶5, 哈斯巴根null1,4, 吕世杰6, 运向军1,4()
收稿日期:
2023-03-06
修回日期:
2023-05-17
出版日期:
2023-12-20
发布日期:
2023-10-18
通讯作者:
运向军
作者简介:
Corresponding author. E-mail: yunxiangjun@126.com基金资助:
Jin-rui WU1,2(), Meng-zhen LI1,2, Yong YANG3,4, Ai-jun LIU3,4, Pu-chang WANG5, Hasibagen1,4, Shi-jie LYU6, Xiang-jun YUN1,4()
Received:
2023-03-06
Revised:
2023-05-17
Online:
2023-12-20
Published:
2023-10-18
Contact:
Xiang-jun YUN
摘要:
为探讨不同放牧强度下典型草原建群种羊草的空间分布特点及规律,本研究以中国农业科学院典型草原试验站羊草植物种群为研究对象,设置对照区(CK)、轻度放牧区(LG)、中度放牧区(MG)和重度放牧区(HG)4个放牧强度,结合箱式图和多重分形等方法展开研究。结果表明:羊草植物种群在不同放牧强度下的空间分布存在多重分形特征;羊草植物种群在中度和重度放牧区空间分布呈现复杂性和不均匀性,而其在对照和轻度放牧区空间分布相对均匀化;随着放牧强度的增大,羊草种群空间分布由均匀转向聚集状态,生态位宽度较为一致,个体间的竞争强度降低。无论放牧强度如何变化,典型草原的羊草种群空间分布特征以大概率子集为主,且其在典型草原试验站放牧强度试验的群落中仍占有主导地位。
吴金蕊, 李梦真, 杨勇, 刘爱军, 王普昶, 哈斯巴根null, 吕世杰, 运向军. 典型草原不同放牧强度下羊草种群空间分布的研究[J]. 草业学报, 2023, 32(12): 68-76.
Jin-rui WU, Meng-zhen LI, Yong YANG, Ai-jun LIU, Pu-chang WANG, Hasibagen, Shi-jie LYU, Xiang-jun YUN. Spatial distribution of the Leymus chinensis population under different grazing intensities in a typical steppe area[J]. Acta Prataculturae Sinica, 2023, 32(12): 68-76.
图2 不同放牧强度下取样尺度与羊草种群密度的lg ε-lg[χq (ε)]关系A: 对照区Control area; B: 轻度放牧区Light grazing area; C: 中度放牧区Moderate grazing area; D: 重度放牧区Heavy grazing area.
Fig.2 lg ε-lg[χq (ε)] relationship between sampling scale and L. chinensis density under different grazing intensities
放牧强度 Grazing intensity | 计盒维数Box counting dimension (D0) | 信息维数Information dimension (D1) | 关联维数Correlation dimension (D2) | 多重分形度Multifractal degree (D1/D0) |
---|---|---|---|---|
CK | 1.0000 | 0.9957 | 0.9914 | 0.9957 |
LG | 1.0000 | 0.9957 | 0.9913 | 0.9957 |
MG | 1.0000 | 0.9826 | 0.9652 | 0.9826 |
HG | 1.0000 | 0.9848 | 0.9696 | 0.9848 |
表1 羊草种群在不同放牧强度下的分形维数
Table 1 Fractal dimension of L. chinensis under different grazing intensities
放牧强度 Grazing intensity | 计盒维数Box counting dimension (D0) | 信息维数Information dimension (D1) | 关联维数Correlation dimension (D2) | 多重分形度Multifractal degree (D1/D0) |
---|---|---|---|---|
CK | 1.0000 | 0.9957 | 0.9914 | 0.9957 |
LG | 1.0000 | 0.9957 | 0.9913 | 0.9957 |
MG | 1.0000 | 0.9826 | 0.9652 | 0.9826 |
HG | 1.0000 | 0.9848 | 0.9696 | 0.9848 |
放牧强度 Grazing intensity | 奇异谱及函数值Singular spectrum and function value [α-f(α)] | 最大值 Maximum (αmax) | 最小值 Minimum (αmin) | 差值 Difference value (Δf) |
---|---|---|---|---|
CK | α(q) | 1.1833 | 0.9547 | 0.2286 |
f[α(q)] | 0.1479 | 0.8128 | 0.6649 | |
LG | α(q) | 1.1036 | 0.9549 | 0.1487 |
f[α(q)] | 0.5615 | 0.8178 | 0.2562 | |
MG | α(q) | 1.2474 | 0.8803 | 0.3671 |
f[α(q)] | 0.3132 | 0.6137 | 0.3005 | |
HG | α(q) | 1.3607 | 0.8872 | 0.4735 |
f[α(q)] | 0.0358 | 0.6110 | 0.5752 |
表2 羊草密度在不同放牧强度下的多重分形奇异谱参数
Table 2 Multiple singular spectrum parameters of L. chinensis density under different grazing intensities
放牧强度 Grazing intensity | 奇异谱及函数值Singular spectrum and function value [α-f(α)] | 最大值 Maximum (αmax) | 最小值 Minimum (αmin) | 差值 Difference value (Δf) |
---|---|---|---|---|
CK | α(q) | 1.1833 | 0.9547 | 0.2286 |
f[α(q)] | 0.1479 | 0.8128 | 0.6649 | |
LG | α(q) | 1.1036 | 0.9549 | 0.1487 |
f[α(q)] | 0.5615 | 0.8178 | 0.2562 | |
MG | α(q) | 1.2474 | 0.8803 | 0.3671 |
f[α(q)] | 0.3132 | 0.6137 | 0.3005 | |
HG | α(q) | 1.3607 | 0.8872 | 0.4735 |
f[α(q)] | 0.0358 | 0.6110 | 0.5752 |
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