Research On Daxing’ Anling Larix; Regeneration Of Fallen Tree Characteristics And Update Mechanism

Pour wood is an important part in forest ecological system, playing many important and special ecological functions.As an important distraction, it stores a large amount of carbon and nutrient, and has significant effect on forest regeneration, maintaining the future of the structure and forest community biological diversity. This paper set the Larix gmelinii,the daxin’anling forest region in Inner Mongolia,as the research object, choosing three typical pine forest types,suah as DuXiang-sing-an leaves pine forests, cuckoo-leaves of grass characterized pine, utilizing modern-leaves.Through the study of pour wood, and the formation mechanism and number of litter, backward, decayed level distribution features and natural update mechanism and impact factor,to explore other features of pour wood and to implement HanWenDai sing-an larch continued operation of visitors to provide the theory basis.The result of the study shows that:(1) The wind is an important mechanism to influence the formation of pour wood.The daxin’anling pour wood mainly concentrated in the northeast and southeast direction, and the update of wood more concentrated in the southeast.(2) In the three types,pour wood focus on middle and high grade rotten, the total number and the total lanceolata plantation is different, but not to significant level.The number of pour wood:grass, leaves, grass1am pine of fallen leaves2am pine (135plants/hm2)>DuXiang sing-an leaves pine forests, update contrast samples (110plants/hm2)>cuckoo sing-an deciduous pine (85plants/hm2); Pour wood existing capacity:grasses sing-an leaves lanceolata plantation pine1(36.724t/hm2)>grasses sing-an deciduous pine2(26.689t/hm)>update contrast samples (23.700t/hm)> cuckoo sing-an deciduous pine (18.952t/hm)>DuXiang sing-an deciduous pine (14.413t/hm). The number of different species of wood is different.the number of larch sing-an wood and wood pour lanceolata plantation significantly greater than pour birch wood, accounting for88%of the total number of pour wood, wood98%of total pour lanceolata plantation.(3) In the original sing-an larch monitoring throughfall, just high level of decadent as III, IV, V level can provide appropriate wood natural regeneration pour water and hot conditions, and with the increasing of decadent level,the number of update wood increases.(4) In the three types, wood moisture content and level was significantly positive correlation; but density with corrupt level was significantly negative correlation. Through the moisture content of wood density and variance analysis, the conclusion is absolutely moisture content and density are grasses leaves>pine forest cuckoo pine leaves DuXiang pine leaves; Relative moisture content for the cuckoo pine>grass leaves of fallen leaves pine>DuXiang deciduous pine forest,but not too significant.(5) In the three types,Betula platyphylla with its organic decomposition pour all the C, K, Na, Ca, Mg showed no significant change trend, the N have significantly increased the trend, the P remain relatively stable.Through the nutrient content for variance analysis, organic carbon, the K, and the P percentage content are characterized the cuckoo leave>pine grasses sing-an pine>DuXiang sing-an leaves leaves pine.All the N, all the Na, Ca percentage content are characterized>DuXiang pine forest cuckoo leaves leaves of grass>pine characterized pine leaves.Mg percentage content of is characterized leaves for grass>cuckoo larch>pine DuXiang sing-an larch.In the three types, through the variance analysis of pour wood itself,the falling objects around, the wood organic C, the humus content P and N, organic C content around the fall has no significant difference, the N and P content of the wood falling object and the humus are greater than pour wood itself.(6) The individual growth status update wood are different in the three types. More updated wood concentrate on the first high sinfonietta IV level; Ground diameter more focuse on Ⅰ, Ⅱ, Ⅲ level.The age of the individual larch sing-an update more concentrated in5to10years, and7years updated account for the maximum. The range of age in Betula platyphylla individual is smaller,focus on2and3years; pour wood updated individual growth parts focus on base and big head,the central more than base, the tail sinfonietta is less.(7) Rotten wood has a very significant influence on the number of level of the update, slope and the wood on the dry falling objects to fall on the thickness of the wood has a significant effect on number of update,the wood on the dry failing objects to fall on hickness of the wood and the number of update on pour wood for negative correlation.