不同初植密度下华北落叶松白桦混交林碳储量的研究

Research on the Carbon Reserves of Larix Principis-rupprechtii Mayr and Betula spp. Mixed Forest under Different Initial Planting Densities

以河北省塞罕坝机械林场华北落叶松、白桦混交林为研究对象,应用FORECAST混合型模型,模拟不同立地质量、不同初植密度下(1600株/hm^2,2000株/hm^2,2500株/hm^2,3000株/hm^2,4000株/hm^2)华北落叶松、白桦混交林林分在未来360年(6个轮伐期)碳储量的时空变化。模拟结果显示:在较好或中等立地条件,初植密度为2500株/hm^2华北落叶松白桦混交林在360年(6个轮伐期)内积累的碳储总量最高;在较差立地条件下,初植密度为4000株/hm^2的混交林在360年(6个轮伐期)内积累的碳储总量最高。华北落叶松白桦混交林在360年(6个轮伐期)内生态系统碳储量呈现上升趋势,并且在较差立地条件下上升趋势更为明显。在较好或中等的立地条件下,华北落叶松白桦混交林初植密度为2500株/hm^2年均固碳量最大,而在较差立地条件下初植密度为4000株/hm^2有利于获得更多的年均固碳量。

Taking Larix Principis-rupprechtii Mayr and Betula spp. mixed forest in Hebei Saihanba Mechanized Forest Farm as the research object, using the FORECAST mixed model, simulating different site quality and different initial planting densities（1600 N/hm^2, 2000 N/hm^2,2500 N/hm^2, 3000 N/hm^2,4000 N/hm^2） divides into temporal and spatial variation of carbon storage in the future 360 years（six rotation period） of Larix Principis-rupprechtii Mayr and Betula spp. mixed forest. The simulation results show： In the rich or medium site conditions, the total carbon storage accumulated of the initial planting density of 2500 N/hm^2 in 360 years（six rotation period） is the highest; in the poor site conditions, the total carbon storage accumulated of the initial planting density 4000 N/hm^2 in the 360 years（six rotation period） is the highest. The carbon storage of forest ecosystem of Larix Principis-rupprechtii Mayr and Betula spp. mixed forest in 360 years（six rotation period） shows an upward trend, and the trend is more obvious in poor site conditions. In the rich or medium site conditions, the initial planting density of 2500 N/hm^2 in 360 years of annual average carbon sequestration is the highest; In the poor site conditions, the initial planting density 4000 N/hm^2 in the 360 years obtains more annual average carbon sequestration.