Modelled potential forest area in the forest-steppe of central Mongolia is about three times of actual forest area
Modelled potential forest area in the forest-steppe of central Mongolia is about three times of actual forest area
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DOI：
10.5194/bg-2020-13
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发表时间：
2020-03
期刊：
影响因子：
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通讯作者：
M. Klinge;C. Dulamsuren;Florian D. Schneider;S. Erasmi;M. Hauck;Uudus Bayarsaikhan;D. Sauer
中科院分区：
文献类型：
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作者：
M. Klinge;C. Dulamsuren;Florian D. Schneider;S. Erasmi;M. Hauck;Uudus Bayarsaikhan;D. Sauer
抽象的。蒙古森林草原对气候变化和环境影响高度敏感。本研究的目的是确定，控制森林分布和树木生长在这个半干旱环境中的地质生态参数，并评估实际和潜在的树木生物量。为此，我们应用了树木生物量和土壤制图，遥感和气候数据分析相结合的研究领域在北方Khangai山，蒙古中部。不同景观单元和立地条件的森林一般表现出较小的差异，树木生物量。我们没有发现树木生物量和归一化植被指数（NDVI）之间的显着相关性。树木生物量减少，在森林边缘，在小破碎的森林站的草原为主的地区，并在大型森林站，相比所有其他森林单位。山坡上森林的树木生物量在25至380兆毫克公顷之间。10-500公顷森林的平均树木生物量为199-220 Mg ha−1，其中森林边缘的树木生物量比森林内部少50-63 Mg ha−1。> 500公顷森林的平均树木生物量为182兆克/公顷，而研究区域的实际森林面积为1，086平方公里。1986年，在大面积森林火灾之前，面积为1，898平方公里。林木实际生物量为20 × 109 g，为1986年的57%.对潜在森林面积建模的结果分别是3 552平方公里，树木生物量为65 × 109克（根据地形参数），3 113平方公里，树木生物量为58 × 109克（根据气候参数）。因此，模拟的潜在森林面积约为实际森林面积的三倍。
Abstract. The Mongolian forest-steppe is highly sensitive to climate change and environmental impact. The intention of this study was to identify, which geoecological parameters control forest distribution and tree growth in this semi-arid environment, and to evaluate the actual and potential tree biomass. For this purpose, we applied a combination of tree biomass and soil mapping, remote sensing and climate data analysis to a study area in the northern Khangai Mountains, central Mongolia. Forests of different landscape units and site conditions generally showed minor differences in tree biomass. We found no significant correlation between tree biomass and NDVI (normalized differentiated vegetation index). Tree biomass was reduced at forest edges, in small fragmented forest stands of the steppe-dominated area, and in large forest stands, compared to all other forest units. The tree biomass of forests on slopes ranged between 25 and 380 Mg ha−1. The mean tree biomass in forests of 10–500 ha was 199–220 Mg ha−1, whereby tree biomass at the forest edges was 50–63 Mg ha−1 less than in the interior parts of the forests. The mean tree biomass of forests > 500 ha was 182 Mg ha−1, whereas that of forests The actual forests of the study area covered 1,086 km2. In 1986, prior to extensive forest fires, it was 1,898 km2. The actual tree biomass of 20 × 109 g represented 57 % of that in 1986. Modelling of the potential forest area resulted in 3,552 km2, with 65 × 109 g tree biomass (based on topographic parameters) and 3,113 km2 with 58 × 109 g tree biomass (based on climatic parameters), respectively. The modelled potential forest area was thus about three times the actual forest area.