Seed dispersal and seedling recruitment ofUlmus pumilawoodland in the Keerqin Sandy Land, China

Yunfei, 杨允菲 Yang; Yunpeng, 白云鹏 Bai; Jiandong, 李建东 Li

doi:10.5846/stxb201111111707

Cited by 3 publications

(1 citation statement)

References 11 publications

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“…Secondly, heterogeneous patches of vegetation cover could cause nonuniform samples in designed experiments [17,18]. Additionally, the effects of grazing on seed dispersal in arid and semiarid lands are commonly intertwined with the wind, the main factor regulating seed dispersal [19][20][21]. This makes disentangling various driving factors extremely difficult.…”

Section: Introductionmentioning

confidence: 99%

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

Sun

2020

Land

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Grazing leads to the reduction of biomass and plays a critical role in land degradation in arid and semiarid lands. However, the indirect effects of grazing on the ecosystem, e.g., the effect on seed dispersal, have not been well understood. In this study, we built an agent-based model (ABM) to simulate how grazing intensity affects the seed dispersal of elm trees, one of the native vegetation species of temperate woodlands in semiarid lands. The simulated results from the ABM and observed data from the real world were compared to assess the accuracy and validity of the ABM. The results show that elm seed densities in non-grazing, light, moderate, and heavy grazing lands were 74.97 ± 1.44, 57.63 ± 0.89, 37.73 ± 0.95, and 0.97 ± 0.05 seeds m−2, respectively—an apparently decreasing trend. Moreover, as grazing intensity increased, the values of nugget, sill, and partial sill decreased and the value of the ratio of nugget to sill increased. This study indicates that the grazing indirectly leads to the reduction of elm seed density and the increase of spatial heterogeneity of elm seed on the ground in sparse elm woodlands. Moreover, values of geostatistical indices from the ABM were not significantly different from field observation data except for the ratio of nugget to sill. It shows that ABMs can reasonably replicate the spatial pattern of elm seed densities in the field and thus are useful for simulating long-distance seed dispersal in sandy lands. This finding suggests that the indirect effects of grazing should be considered to effectively protect sparse elm woodlands.

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Section: Introductionmentioning

confidence: 99%

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

Sun

2020

Land

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The effects of grazing on the spatial pattern of elm (Ulmus pumila L.) in the sparse woodland steppe of Horqin Sandy Land in northeastern China

Zhang

2016

Solid Earth

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Abstract. The aim of this study was to explore the effects of grazing on the formation of the spatial pattern of elm growth in a sparse woodland steppe. We used a point pattern method to analyze the elm trees within different diameter at breast height (DBH) classes in both grazed and fenced plots, which were established in Horqin Sandy Land of northeastern China. The results showed that, in the grazed plot, the distances where transformation between random and clustered patterns occurred in class 1 (10 cm ≤ DBH ≤ 15 cm) and class 2 (15 cm < DBH ≤ 20 cm) were 2.27 and 2.37 m, respectively. Meanwhile, in the fenced plot, the distances between random and aggregated patterns that occurred in classes 1, 2 and 3 (DBH > 20 cm) were 3.13, 3.13 and 7.85 m, respectively. In the fenced plot, at distances larger than 67.72 m there was a negative association between classes 1 and 2, which was also the case between classes 2 and 3 and between classes 1 and 3 for distances greater than 104.09 and 128.54 m, respectively. Meanwhile, negative associations occurred only at distances larger than 29.38 m in the grazed plot. These findings suggest that grazing reduced the competition intensity between elm trees; and therefore, grazing management could be an effective strategy used to regulate the elm population in the degraded sandy land of northern China.

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The effects of grazing on the spatial pattern of elm (Ulmus pumila L.) in the sparse woodland steppe of Horqin Sandy Land in Northeastern China

Zhang¹,

Wu²,

Yi³

2015

Preprint

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Abstract. The aim of this study was to explore the effects of grazing on the formation of the spatial pattern of elm growth in a sparse woodland steppe. We used a point pattern method to analyze the elm trees within different diameter classes in both grazed and fenced plots, which were established in Horqin Sandy Land, northeastern, China. The results showed that, in the grazed plot, the distances where transformation between random and aggregated patterns occurred in class 1 (10 cm ≤ DBH ≤ 15 cm) and class 2 (15 cm ≤ DBH ≤ 20 cm) were 2.27 and 2.37 m, respectively. Meanwhile, in the fenced plot, the distances between random and aggregated patterns that occurred in class 1, class 2 and class 3 (DBH > 20 cm) were 3.13, 3.13 and 7.85 m, respectively. In the fenced plot, in distances larger than 67.72 m there were a negative association between class 1 and class 2, which was also the case between class 2 and class 3 and between class 1 and class 3 for distances greater than 104.09 and 128.54 m, respectively. Meanwhile, negative associations occurred only with distances larger than 29.38 m in the grazed plot. These findings suggest that grazing reduced the competition intensity between elm trees; and therefore, grazing management could be an effective strategy used to regulate the elm population in the degraded sandy land of Northern China.

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Seed dispersal and seedling recruitment ofUlmus pumilawoodland in the Keerqin Sandy Land, China

Cited by 3 publications

References 11 publications

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

The effects of grazing on the spatial pattern of elm (<i>Ulmus pumila</i> L.) in the sparse woodland steppe of Horqin Sandy Land in northeastern China

The effects of grazing on the spatial pattern of elm (<i>Ulmus pumila</i> L.) in the sparse woodland steppe of Horqin Sandy Land in Northeastern China

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Seed dispersal and seedling recruitment ofUlmus pumilawoodland in the Keerqin Sandy Land, China

Cited by 3 publications

References 11 publications

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

Indirect Effects of Grazing on Wind-Dispersed Elm Seeds in Sparse Woodlands of Northern China

The effects of grazing on the spatial pattern of elm (&lt;i&gt;Ulmus pumila&lt;/i&gt; L.) in the sparse woodland steppe of Horqin Sandy Land in northeastern China

The effects of grazing on the spatial pattern of elm (&lt;i&gt;Ulmus pumila&lt;/i&gt; L.) in the sparse woodland steppe of Horqin Sandy Land in Northeastern China

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The effects of grazing on the spatial pattern of elm (<i>Ulmus pumila</i> L.) in the sparse woodland steppe of Horqin Sandy Land in northeastern China

The effects of grazing on the spatial pattern of elm (<i>Ulmus pumila</i> L.) in the sparse woodland steppe of Horqin Sandy Land in Northeastern China