我国华北地区落叶松林碳储量动态研究

通过对解析木及一类林业调查样地材料碳储量及碳密度的研究,求出树木碳增量的年降水、材积及时间阀值,得出落叶松碳密度增长的材积限制条件年生长量现实林为2.84m3/hm2,近自然林6.837m3/hm2,理想林8.052m3/hm2,均不能高于这一阀值;时间限制条件为近自然林为区间(3.58a,19.95a),理想林为(6.4a,20.33a);降水量限制条件为年降水量区间现实林为(586.18mm,756.86mm),近自然林(435.55mm,1508.1mm),年降水量高于690.3mm,出现负相关,理想林(0,958.87mm),年降水量高于690.5mm,出现负相关,因此年降雨量超过690.3mm,不宜进行浇水作业,即使进行浇水,也不要高于这一当量。平均递增速度最快的年份近自然林为16.14a;即时递增速度最快的年份为8.07a。过多的人为干扰使树木适应的生态位宽度(包括时间生态位、降雨量生态位、材积生长量等)明显变得狭窄,引起蓄积量及碳密度拓展空间明显变小,因此发展近自然林业势在必行。

Forest Organic Carbon Storage and Its Trend of Larch in North China

According to the data of Carbon Storage and C density of parse wood and continuous forest inventory, discussed empirical equation, such as this, made variable of Forest Organic Carbon Storage, made independent variable of yearly precipi tation,time and forest created the function. Through computational mathematics as a derivation of the function operation, found the tree growth in annual rainfall , time, and its volume of timher,of threshold values, limiting values , extreme values. Drew the extreme values with empirical equation y（p）= e^a-b/p. Drew the limiting values with empirical equation y= a-b/x, y= a ＋ bx, y= a＋ blnx. Drew the threshold values with empirical equation y = 1/（a＋ blnx）, y = 1/（ a ＋ bx）. The limiting values of volume growth with the growth of C density was 2.84m^3/hm^2 of real forest ,6. 837m^3/hm^2 of near nature forest and8. 052m^3/ hm^2 of perfect forest. In order to increase of C density progressively , the limiting values of time was in the interval （3. 58a, 19.95a） of near nature forest and （6.4a,20.33a）of perfect forest,the age of average was 16.14a and the real time was8.07a of near nature forest. In order to growth of C density, The limiting values of annual rainfall was in the interval （586. 18mm, 756.86mm） of real forest , （435. 55mm,1508. lmm）of near nature forest ,and （0,958. 87mm）of perfect forest. That there would be negative growth of C density of near nature forest with the annual rainfall that was hyper than 690.3mm, and it is was the same that was 690.5mm of perfect forest. It would become more and more limited that was niche breadth （such as time , annual rainfall and growth of volume ）because more man--made interference obviously. The extending space of volume and C density would be smaller in evidence. Discussed the application, research interests and considerations.