The Classification Indices-Based Model for NPP According to the Integrated Orderly Classification System of Grassland and Its Application

Lin, Huilong

doi:10.5772/57297

Cited by 3 publications

(1 citation statement)

References 80 publications

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“…identified potential hotspot areas of desertification and land degradation by comparing PNPP and ANPP estimates yielded by the Chikugo model, and an improved CASA model. Based on the classification indices-based (CI) model, Lin et al [28] generated NPP estimates for potential terrestrial vegetation in China over 1961-2006, and calculated an annual range of 1.93-4.54 Pg C for the total NPP of potential terrestrial vegetation in China under present climatic conditions [29]. Zhao et al [30] employed the CI model to yield NPP estimates for each potential type of vegetation in Inner Mongolia over the period 1982-2009, based on an integrated orderly classification system.…”

Section: Introductionmentioning

confidence: 99%

The Restoration Potential of the Grasslands on the Tibetan Plateau

et al. 2021

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While the alpine grassland ecosystems on the Tibetan Plateau (TP) have generally improved in recent years, some grasslands still suffer from varying degrees of degradation. Studying the restoration potential (R) of the grasslands on the TP is crucial to the conservation and restoration of its alpine grassland ecosystems. Few studies have assessed the restoration value of the alpine grasslands on the TP. We attempt to estimate the actual (ANPP) and potential net primary productivity (PNPP) of the grasslands on the TP. On this basis, we defined R as the “gap” between the current and highest achievable levels of restoration of a grassland. Then, R estimates were yielded for the alpine grasslands on the TP, which we used to analyze the restoration value of these grasslands. Specifically, based on the meteorological data for the period 2001–2019, in conjunction with remote-sensing imagery acquired by a moderate-resolution imaging spectroradiometer for the same period, the Carnegie–Ames–Stanford approach model was selected to produce ANPP estimates for the grasslands on the TP. Then, the Thornthwaite memorial model, the principle of similar habitats, and the Chikugo model, were employed to generate PNPP estimates for these grasslands. In addition, the R of these grasslands was then assessed based on the difference between their PNPP and ANPP. The main results are summarized as follows. (1) A multiyear mean R of 332.33 g C·m–2 (81.59% of the ANPP) was determined for the grasslands on the TP over the period 2001–2019. A notable spatial distribution pattern of high Rs in the southwestern, eastern and middle parts of the TP, and low Rs in the northwestern part of the TP were also identified. Most of the grasslands in areas such as the southern part of Nagqu, the southwestern part of Ngari, Xigaze, Garze Tibetan Autonomous Prefecture, Aba Tibetan and Qiang Autonomous Prefecture, Gannan Tibetan Autonomous Prefecture, Huangnan Tibetan Autonomous Prefecture, Haibei Tibetan Autonomous Prefecture, Guoluo Tibetan Autonomous Prefecture and Yushu Tibetan Autonomous Prefecture were found to have high restoration value. (2) Grasslands with a stable R account were the highest proportion (76.13%) of all the grasslands on the TP, followed by those with a decreasing R (19.62%) and those with an increasing R (4.24%). Grasslands with an increasing R were mainly concentrated in the southern part of Xigaze, and parts of Yushu Tibetan Autonomous Prefecture, Guoluo Tibetan Autonomous Prefecture and Garze Tibetan Autonomous Prefecture. (3) Analysis based on the local conditions of the TP revealed a high restoration value for three types of grassland (i.e., alpine meadows, mountain meadows, and temperate meadow steppes), the grasslands distributed at altitudes of 3000–4000 m, and the grasslands located in the warm temperate zone. The results of this study are expected to provide scientific and theoretical support for the formulation of policies and measures aimed at conserving grasslands, as well as restoring ecosystems and degraded grasslands on the TP.

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Section: Introductionmentioning

confidence: 99%

The Restoration Potential of the Grasslands on the Tibetan Plateau

et al. 2021

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Net Primary Production of Steppe Ecosystems and the Reasons Underlying Its Spatial Variation

Titlyanova,

Vishnyakova,

Smolentseva

2024

Eurasian Soil Sc.

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Net Primary Production of Steppe Ecosystems and the Reasons for its Spatial Variability

Titlaynova,

Vishnyakova,

Smolentseva

2024

Počvovedenie

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The purpose of the article is to analyze the values change of net primary production: aboveground (ANP), belowground (BNP) and total (NPP) for meadow, true and dry steppes. The investigated meadow and true steppes are located between 36 and 116° E, 47 and 56° N. In Tyva, the production of dry steppes is determined on various elements of the relief – from the upper part of the mountain to the depressions located in the bottom of the slope. The value of ANP in the meadow steppes varies from west to east from 10.2 to 3.1, in the true steppes from 5.8 to 0.7 t/ha per year and depends on many factors, including air temperature, precipitation, and soil properties. The soil properties are defined by a set of conditions: the position of the ecosystem on the relief, which leads to different soil moisture. Both, the meadow and true steppes, have irregularities in the decrease of the ANP value from west to east. In some cases, in a series of meadow steppes instead of a decrease, an increase of ANP is observed, which is explaining by changes in soil conditions. The first increase from 4.8 (63° E) to 6.1 t/ha per year (73° E) occurs when Luvic Chernozem (Loamic) is replaced by Inclinigleyic Chernozem (Loamic), as a result of additional soil moistening. The second increase of ANP from 3.6 (75° E) to 6.6 t/ha per year (90° E) is observed when the soil changes from Tonguic Chernozem (Siltic) to Haplic Chernozem (Siltic, Pachic). The increases of ANP were observed in the true steppes: 1) when Skeletic Kastanozem (Siltic) changed to Calcic Chernozem (Siltic), 2) when Haplic Solonetz (Loamic) changed to Calcic Chernozem (Loamic), 3) when soil changes from Mollic Leptosol (Siltic) to Calcic Chernozem (Siltic). The value of BNP in meadow and true steppes in the soil layer of 0–30 cm generally decreases from west to east from 26.8 to 7.7 t/ha per year, varying without a visible pattern. In Tyva, due to the change in the relief, ANP of dry steppes varies from 3.7 to 1.7, BNP – from 27.0 to 8.7 t/ha per year. Consequently, the amount of aboveground production of grass ecosystems is determined not only by air temperature and precipitation, but also by the properties of soils, which vary in structure, Corg content, nutrients, and watering.

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The Classification Indices-Based Model for NPP According to the Integrated Orderly Classification System of Grassland and Its Application

Cited by 3 publications

References 80 publications

The Restoration Potential of the Grasslands on the Tibetan Plateau

The Restoration Potential of the Grasslands on the Tibetan Plateau

Net Primary Production of Steppe Ecosystems and the Reasons Underlying Its Spatial Variation

Net Primary Production of Steppe Ecosystems and the Reasons for its Spatial Variability

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