Impact of Grazing Exclusion on the Surface Heat Balance in North Tibet

Yunfei FENG; Yingwei DI; Jing ZHANG; Xianzhou ZHANG; Peili SHI; Ben Niu

doi:10.5814/j.issn.1674-764X.2020.03.005

Journals >Journal of Resources and Ecology >Volume 11 >Issue 3 >Page 283 > Article

Journal of Resources and Ecology
Vol. 11, Issue 3, 283 (2020)

Impact of Grazing Exclusion on the Surface Heat Balance in North Tibet

Yunfei FENG¹, Yingwei DI¹, Jing ZHANG², Xianzhou ZHANG^3、*, Peili SHI³, and Ben Niu³

Author Affiliations

¹Tangshan Normal University, Tangshan 063000, Hebei, China

²College of Global Change and Earth System Sciences, Beijing Normal University, Beijing 100875, China

³Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

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DOI: 10.5814/j.issn.1674-764X.2020.03.005 Cite this Article

Yunfei FENG, Yingwei DI, Jing ZHANG, Xianzhou ZHANG, Peili SHI, Ben Niu. Impact of Grazing Exclusion on the Surface Heat Balance in North Tibet[J]. Journal of Resources and Ecology, 2020, 11(3): 283 Copy Citation Text

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Abstract

Many recent studies have focused on vegetation feedback to climate systems in sensitive areas like the Qinghai-Tibetan Plateau. Providing allowances and awards to households engaged in animal husbandry that practice grazing exclusion to restore degraded grassland is an important eco-compensation policy effort in China. Grazing exclusion influences grassland variations (Cai et al., 2015). Numerous observational and modelling studies have confirmed that land sur-face conditions play a crucial role in climate change (Pielke et al., 2002; Kalnay and Cai, 2003; Feddema et al., 2005; Pitman and Narisma, 2005; Seneviratne et al., 2006; Pielke et al., 2007). Land surfaces impact the atmosphere through the exchange of energy, momentum, water, carbon dioxide and other gases with the atmospheric boundary layer (Cox et al., 2000; Bounoua et al., 2002).

Keywords

albedo evapotranspiration grazing exclusion LST northern Tibetan Plateau surface heat balance

$slop{{e}_{i}}=\frac{n\times \sum\limits_{i=1}^{n}{(i\times {{x}_{i}})-(\sum\limits_{i=1}^{n}{i)\times \sum\limits_{i=1}^{n}{{{x}_{i}}}}}}{n\times \sum\limits_{i=1}^{n}{{{i}^{2}}-{{(\sum\limits_{i=1}^{n}{i})}^{2}}}}\text{ }$

(1)

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${{\bar{s}}_{i}}={slop{{e}_{i}}}/{\left( \frac{1}{n}\times \sum\limits_{i=1}^{n}{x{}_{i}} \right)}\;$

(2)

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$Sn+Ln=\lambda E+H+G$

(3)

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$Sn\text{ = }S\times \tau \times \text{(1-}\alpha \text{)}$

(4)

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$\lambda \times E=\lambda \times \beta \times Ep$

(5)

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$H=\rho \times Cd\times \frac{Ts-Ta}{ra}$

(6)

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$L\downarrow =\varepsilon a\times \sigma \times {{T}_{a}}^{4}$

(7)

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$L\uparrow =(1-\varepsilon s)\times \varepsilon a\times \sigma \times {{T}_{a}}^{4}+\varepsilon s\times \sigma \times {{T}_{s}}^{4}$

(8)

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$\begin{align} 【-逻*辑*与-】amp; \text{ }S\tau \times \text{(1}-\alpha \text{)}-\lambda \times E \text{=}\rho \times Cd\times \frac{Ts-Ta}{ra}-\varepsilon s\times \sigma \times \varepsilon a\times ({{T}_{a}}^{4}-{{T}_{s}}^{4}) \end{align}$

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$\begin{align} \Delta Ts\text{=}\frac{1}{fs}\times \left( -S\tau \times \Delta \alpha -\lambda \times \Delta E\text{+}S\times \text{(1}-\alpha \text{)}\times \Delta \tau +\rho \times \right. \text{ }\left. Cd\times \frac{Ts-Ta}{ra}\times \Delta ra+\varepsilon s\times \sigma \times {{T}_{a}}^{4}\times \Delta \varepsilon a \right) \end{align}$

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$fs=\rho \times Cd/ra+4\times \varepsilon s\times \sigma \times {{T}_{s}}^{4}$

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$\begin{align} \Delta Ts\text{=(}4\times \varepsilon \times \sigma \times {{T}_{s}}^{3}{{\text{)}}^{-1}}\times \text{(}-Rsi\times \Delta \alpha \text{+}S\times \text{(1}-\alpha \text{)} \text{ }\times \Delta Rsi+\Delta Rli-\lambda \times \Delta E-\Delta H-\Delta I-\sigma \times {{T}_{s}}^{4}\times \Delta \varepsilon \text{)} \end{align}$

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Yunfei FENG, Yingwei DI, Jing ZHANG, Xianzhou ZHANG, Peili SHI, Ben Niu. Impact of Grazing Exclusion on the Surface Heat Balance in North Tibet[J]. Journal of Resources and Ecology, 2020, 11(3): 283

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