The Larix Forest Litter Release Rule Of Decomposition In Liaodong Mountain Of China

Larch olgensis Henry of pinaceae larix deciduous trees, is one of the most important timber tree species in north China. Starting in the1950s planted larch, problems are emerging, such as single tree, simple structure, slow litter decomposition, soil fertility decline, etc.; larch pure forest nutrient imbalance between output and input of nutrients, the number of litter and soil fertility decline because of lower quality factor. Of this study is the main source of soil nutrients from the forest litter and litter by adding different tree species, the method of research of larch litter decomposition and nutrient release rule and the influence on soil biochemical properties, and compared with the liaodong mountainous forest research, in order to provide theoretical basis for construction larch and broad leaved tree species of mixed forests. The specific research results are as follows:1. Larch and secondary forest adding of litter enriched microbes in the soil after the required nutrients, the microbe quantity increased, so that the CO2release a quantity to increase, but with the adding of litter decomposition, the CO2release rate increases first and then decline.2. Itself contains larch forest soil microbial biomass carbon and nitrogen is lower than the secondary forest. Compared with the CK after adding litter decomposition can release nutrients for microorganisms provides a good living environment, so that the microbial quantity increase. WSOC, WSON is microbes can direct use of nutrients, trace of carbon and nitrogen have a certain correlation.3. Larch forest enzyme activity is low, it is difficult for litter decomposition, the secondary forest at the highest maple wood litter the enzyme activity indexes, it is mixed with larch litter, enzyme activity of larch itself has certain improvement. In addition microorganism quantity, pH, CO2is the influence factors of enzyme activity. 4. This study shows that the liaodong mountainous area main tree species in the process of litter decomposition element change rule:a large amount of residual elements Ca> Mg> K; Trace element residual Fe> Mn> zinc. Law of residual elements and there are differences, K increased after reducing first; Mg base in accumulated before release; Ca, Mn, Zn continues to accumulate, larch contains nutrients are lower than the other three broad leaved tree species, except Fe element. larch mixes with other tree species can improve the content of nutrient elements.5. Larch litter high lignin content, slow decomposition than other tree species. And of larch litter decomposition of cellulose and lignin content is low. Therefore mixes with other tree species, improve the quality of larch litter itself, thus accelerate the degradation of lignin and cellulose.