The Coastal Shelter Forest Restoration Process Of Litter And Composition Of The Nutrient Characteristics

In this study, the sandy coast of Dongshan Island, with four kinds of different shelterbeltstudy, Different stand on the four kinds of samples (sample A: natural secondary forest samples B:Pinus elliottii-Bambusa blumeana-Litsea glutinosa mixed sample C: Casuarina equisetifolia-Litsea glutinosa mixed samples D: Casuarina equisetifolia Chunlin), litter characteristics,Including the return of the number of litter production and composition, nutrient content andnutrient dynamics of litter decomposition and litter calorific value, etc., designed to reveal thecoastal shelter forest ecosystem material cycle regularity and energy flow, to provide a theoreticalbasis for the maintenance of soil fertility and improve stand productivitycoastal shelterbeltrehabilitation and reconstruction, to provide a basis for sustainable management of information.The results are as follows:1. natural secondary forest,Pinus elliottii-Bambusa blumeana-Litsea glutinosa mixed,Casuarina equisetifolia-Litsea glutinosa mixed,Casuarina equisetifolia Chunlin, the annuallitterfall were9954.1kg/hm~2,7997.678kg/hm~2,12798.14kg/hm~2,12497.37kg/hm~2; Thecomposition of the litter, leaves an advantage, in addition to the proportion of samples A leaf littertotal litterfall over70%,4each component of the woodland leaves the proportion of the generalcomponents of the order of the leaf> branch> debris. Samples in each natural secondaryforest,Pinus elliottii-Bambusa blumeana-Litsea glutinosa mixed from broadleaf litter majority ofCasuarina equisetifolia-Litsea glutinosa mixed,Casuarina equisetifolia Chunlin from Casuarinalitter majority Casuarina-Litsea glutinosa mixed litter large in Casuarina Chunlin litter; litterfrom the stands in a year of change curve, natural secondary forest,Pinus elliottii-Bambusablumeana-Litsea glutinosa mixed twice litterfall peak of the bimodal Casuarina equisetifolia-Litsea glutinosa mixed,Casuarina equisetifolia Chunlin show some seasonal variation, but there isno obvious peak.2. natural secondary forest,Pinus elliottii-Bambusa blumeana-Litsea glutinosa mixed of leaflitter nutrient content in order: C>Ca>N>K>Mg>P, Branches, other debris C> Ca> N> Mg> K> P,cone nutrient content of the order of basic C> N> Ca> K> Mg> P; Casuarina equisetifolia-Litseaglutinosa mixed,Casuarina equisetifolia Chunlin litter leaves, branches,other debris in the nutrientcontent of the order of the basic C> Ca> N> Mg> K> P, the cone nutrient content of the order C>N> Ca> K> Mg> P. Trace elements in annual average content can be seen: four kinds of stands,litter leaves, branches and other debris in the nutrient content of the order of basic Fe> Mn> Cu>Zn, cone nutrient content of the order of the basic of Fe> Mn> Zn> Cu.Large number of elements of the four types of forests litter nutrient return the total size of theorder: the size of the sample A> sample C> sample D> sample B,6elements in each stand litterrestitution order is notdo the same, C, N, and Fe, Mn, Zn return in order as follows: sample C>sample A sample D> B; of Ca, K return in the following order: sample A> sample C> sample D>sample sample B; P annual return in the order: sample A> sample to B> sample C> sample to D;of Mg annual return of the amount of the order: sample C> sample samples A> D> sample B.Four kinds of stand litter in a large number of elemental nutrients annual return size are: C> Ca> N> Mg> K> P. Trace elements in the size of the restitution amount are: Fe> Mn> Zn> Cu.Compare nutrient return the size of litter of each component are deciduous return of the largest andnutrient return of the four woodland of each component can be divided into two categories: naturalsecondary forest,Pinus elliottii-Bambusa blumeana-Litsea glutinosa mixed: leaf> debris> branchcones, Casuarina equisetifolia-Litsea glutinosa mixed,Casuarina equisetifolia Chunlin: leaf>branch> cone> debris.Four kinds of stands, samples A, N, P, K, Ca and Mg and Fe and Zn in the nutrient mostefficient use of samples C on nutrient use efficiency of C, Mn, corresponding to the efficiency ofnutrient utilization ratios199.3and2039.8, like D for Cu in nutrient use efficiency.3. The time required for half-life of nine kinds of litter decomposition, decomposition of50%0.386a-1.1a of Slash Pine and Casuarina required the longest time. The time to break down the95percent required for1.66a-4.25a. Litter decomposition rates in order was: Anodendron affine>Sageretia thea> Pistacia chinensis> Bambusa blumeana> Celtis tetrandra subsp.sinensis> Ficusmicrocarpa> Litsea glutinosa> Casuarina> Pinus elliottii. Initialize the chemical composition oflitter decomposition rates were as follows: P> C/P/N> N> C. This indicates that the initial litterP content and C/P ratio is the main factor to control the decomposition rate.4. Nine kinds of litter dry weight of the calorific value of between17.3-22.48kJ/g, whichLitsea glutinosa, Casuarina, Pinus elliottii litter higher calorific value of dry weight, the caloricvalues are20.0kJ/g,more; Celtis tetrandra subsp.sinensis, Bambusa blumeana litter dry weight ofthe lower calorific value of17.3-19.1kJ/g; Pistacia chinensis, Sageretia thea, Ficus microcarpa,Anodendron affine between19-20kJ/g. Casuarina, Anodendron affine, Pinus elliottii, Bambusablumeana caloric value is the highest in the spring, Litsea glutinosa, Pistacia chinensis, Celtistetrandra subsp.sinensis, Sageretia thea, Ficus microcarpa dry weight of the calorific value of thehighest in the summer. Litter C concentration determines the level of the energy size of the litter,the caloric value and nutrient content are not significant.