长白落叶松人工林热值及其能量现存量

采用量热法对5个径级的长白落叶松各器官热值进行测定,结合生物量的数据,对长白落叶松的能量现存量进行研究。结果表明:长白落叶松各器官能量现存量模型W=aD~b最适推算长白落叶松的能量现存量。长白落叶松各器官热值的测定结果显示:枝皮干叶根。各器官的能量现存量呈现:干根皮枝叶的规律,能量现存总量1988.39×10~9J/hm~2,地上部分能量现存量远远高于地下部分,主要集中在0—12 m的树段,地下部分主要集中在粗根和根坨。对比5个径级根系的能量现存量,20径级根系的能量现存量最大(187.73×10~9J/hm~2),8径级根系的能量现存量最小(7.72×10~9J/hm~2)。对比5个径级长白落叶松的能量现存量,16径级的能量现存量最大(723.45×10~9J/hm~2),8径级的能量现存量最小(46.58×10~9J/hm~2)。对比长白落叶松和樟子松的能量现存量可知:长白落叶松小于樟子松。

Caloric value and total standing crop energy of Larix olgensis henry gmelinii

The caloric values of vegetation are indicative of energy conversion in the forest ecosystem, and serve as a measure of the energy that plants contain. Studies of seasonal changes in the caloric values of vegetation play a valuable role in promoting forest productivity and systemic energy input. Energy analyses are a method of evaluating the structure and function of a forest ecosystem, and contribute to the promotion of forest stand productivity by representing the amount of solar energy available to the vegetative community. Research on plant energy resource development has been conducted in the interest of alleviating the energy crisis and facilitating the conservation of the ecological environment. In this study, we conducted contrastive analyses of the caloric values and standing crop energy from different 5 diameter classes of organs of the 24-year-old Larix olgensis Gmelinii plantation on Mopan Mountain, in order to study their capacity to accumulate and store energy. The resulting knowledge of Larix olgensis Gmelinii plantation productivity will provide theoretical guidance for the improvement of Larix olgensis Gmelinii plantation management.Three healthy plants were sampled in plots on a Larix olgensis Gmelinii plantation, tree organs in 5 different diameter classes were collected, with 4 cm as one differentiating level. A Monsic layering and cutting method was adopted on the ground, to measure the characteristics of fresh trunk, bark, branch, and leaf material with 2 m as one differentiating level. A standard underground root evaluation method was adopted to measure the characteristics of roots. To ensure the accuracy of the data and effective, the following material was collected:trunk at breast height, 1- to 2-year-old branch bark, perennial branch bark, trunk bark, 1- to 2-year-old branches, and perennial branches. As for leaf material, the canopy was divided into 3 layers, and leaves were collected from the east, south, west, and north of each layer. To collect root material, the root system was subdivided into root stumpage, thick roots, mid-roots, and thin roots. Caloric values were measured to study the 5 diameter classes of various Larix olgensis Gmelinii organs. The total standing crop energy of Larix olgensis Gmelinii was studied in addition to the biomass data.The results showed that in order to quantify the total standing crop energy in each Larix olgensis Gmelinii organ, W=aD^b was the most suitable model for projecting the total standing crop energy of in Larix olgensis Gmelinii trees. The calorific values of various Larix olgensis Gmelinii organs were ordered as follows:branch > bark > trunk > leaf > root. The total standing crop energy of different Larix olgensis Gmelinii organs was ordered as follows:trunk > root > bark > branch > leaf. The total standing crop energy was 1988.39×10⁹ J/hm², with that of the aboveground material (mainly concentrated among 0-12 m plants) being far greater than that of the underground material (mainly concentrated in root stumpage and thick roots). Contrastive analyses of the total standing crop energy in 5 diameter-classes of roots suggested that 20 cm diameter-class roots contain the highest total standing crop energy, at 187.73×10⁹ J/hm², and 8 cm diameter-class root contain the lowest total standing crop energy, at 7.72×10⁹ J/hm². Contrastive analyses of the total standing crop energy in 5 diameter-classes of Larix olgensis Gmelinii organs suggested that the 16 cm diameter-class contained the highest total standing crop energy, at 723.45×10⁹ J/hm², and the 8 cm diameter-class contained the lowest total standing crop energy, at 46.58×10⁹ J/hm². Comparison of the total standing crop energy between Larix olgensis Gmelinii and mongolica Litv, revealed that the total standing crop energy of Larix olgensis Gmelinii was lower than that of mongolica Litv.