Studies On The Fertilizer Mechanism Of High-yield Bamboo Forests In Coastal Sandy Area

Dendrocalamus oldhamli, Dendrocalamopsis vario-striata, Dendrocalamopsis beecheyanus var. puhescens, Dendrocalamus latiflorus , Dendrocalamus minor var.amoenns, Dendrocalamus minor, Acidosasa edulis,Oligostachyum labricum and Dendrocalamus brandisii are plants of wide usage, short growing cycle and wide accommodation. In the long past term, Casuarina equisetifolia, the only successive tree spieces, dominated the components of the coastal shelterbelt, and thus caused the decline of the stands quality and the difficulty of regeneration. And the ability of selt-reproduced of the bamboo is strong. That the rhizomatous is mutual tortility is perfect vegetation, the climate of southeast coastal is adaptable to the growth of bamboos. There are not only economy benefits but also ecolgy benefits of D.oldhamli and D.vario-striat et al. The present study was the first systematic exploration on the fertileizeration mechanism of high-yield bamboo forests in coastal sandy area.These includes the changes of physiological and biochemistry(weight of leaf,chlorophyll), photosynthesis(net photosynthesis ,light respiration,dark respiration)and the nutrient of leaf(total N,P,K)of 9 kinds of bamboos , such as Dendrocalamus oldhamli ,etc. Thus offer the scientific theoretical foundation for managing bamboos forests in the sandy area. The main findings were as follows:1. The growth condition and adaptability of bamboo are good in Coastal sandy area, but it has a bit of contrast on account of difference in adaptability. The reserve rate of each bamboo exceeded 90%,the width of clump crown was up to 3.5m,the canopy density are up to 6.5 or exceeded it In other word there were all shown that nine kinds of bamboos have suited for growing in coastal sandy.2. Orthogonal test of inorganic fertilizer impact on the nutrient of leaf of six kinds of bamboos showed that the content of N,P and K have significant difference during growing bamboo shoots ,the content was lowest in last stage ,each factor have different effect for the nutrition of leaves in different growth period.but in large, the optimum level of factors was the total fertilizer and the proportion have significant effect and the method of fertileizer effect disobvious.The optium level composition of different kinds of bamboo was different The optium proportion of N,P,K of D.beecheyana ,D.latiflorous, d.oldhami .D.minor var.amoenus was 2:l:l,and that of D.vario-striata ,D.minor is 3:2:1. The optium amount of D.beecheyana was 1080 kg.hm^-2,that of D.latiflorous, d.oldhami .D.minor var.amoenus ,D.vario-striata ,D.minor was 720 kg.hm^-2.3. Orthogonal test of inorganic fertilizer impact on photosythesis six kinds of bamboos showed that the content of N, P and K have significant difference during growing bamboo shoots ,the content was lowest in last stage ,each factor have different effect for the nutrition of leaves in different growth period,but in large, the optimum level of factors was the total fertilizer and the proportion have significant effect and the method of fertileizer effect disobvious. The optium level composition of different kinds of bamboo was different The optium proportion of N,P,K of D.beecheyana ,D.latiflorous was 2:1:1,and that ofD.oldhami ,D.vario-striata ,D.minor var.amoenus was 3:2:l.The optium amount of D.beecheyana D.minor var.amoenus was 1080 kg.hm"2, that of D.latiflorons, D.oldhami .D.minor var.amoenus .D.vario-striata was 720 kg.hm'2.4. Orthogonal test of inorganic fertilizer impact on weight of leaf of six kinds of bamboos showed that the content of N, P and K have significant difference during growing bamboo shoots ,the content was lowest in last stage ,each factor have different effect for the nutrition of leaves in different growth period,but in large, the optimum level of factors was the total fertilizer and the proportion have significant effect and the method of fertileizer effect disobvious. The optium level composition of different kinds of bamboo was different The optium proportion of N,P,K of D.latiflorous.D.oldhami.D.vario-striata.D.minor var.amoenus was 5:2:1, that of D.beecheyana was 3:2:1 and that of D.minor was 2:1:1 .The optium amount of D.beecheyana D.minor var.amoenus was 1080 kg.hm"2, that of D.latiflorous, D.oldhami ,D.minor var.amoenus .D.vario-striata was 720 kg.hm"2.5. The resultof leaf's nutrient effected by different fertileizer have shown that :during different growing bamboo shoots ,the regression equation of the content of N in different bamboos have shown that the regression appeared faint in D.oldhami, D.vario-striata, D.var. pubescens, A.edulis, O.labricum and appeared obvious in the D.latiflorus .the line regression appeared great distinctness in D.brandisii in initial stage ;in the prosperous stage.the line regretssion have shown faintly in D.oldhami, D.beecheyana var. pubescens, A.edulis and obvious in D. brandisii and great evidence in D.latiflorus, D.vario-striata, O.labricum .while in the last stage.all of the line regretssion have shown faintly.During different growing bamboo shoots ,the regression equation of the content of P in different bamboos have shown that the regression appeared faint in D.atiflorus, A.edulis, O.labricum and appeared obvious in D.oldhami, D.vario-striata, D.beecheyana var. pubescens D.brandisii in initial stage ;in the prosperous stage the line regression have shown faintly in D. brandisii D.beecheyana var. pubescens, A.edulis O.labricum and obvious in D.oldhami ,D.latiflorus and great evidence in D.vario-striata, while in the last stage, the line regression appeared faint in D.oldhami, D.vario-striata, D.beecheyana var. pubescens , D.brandisi, A.edulis, O.labricum and appeared obvious in D.latiflorus.During different growing bamboo shoots.the regression equation of the content of K in different bamboos have shown that the regression appeared faint in D.oldhami, D.vario-striata, Dendrocalamopsis beecheyana var. pubescens, D.latiflorus, A.edulis, O.labricum in initial stage and last stage ;in the prosperous stage the line regression have shown faintly in D.oldhami, D.beecheyana var. pubescens, D.latiflorus, O.labricum,A.edulis and obvious in D.brandisii and great evidence in D.vario-striata.6. The result of photosynthesis effected by different fertileizer have shown that the regression of net photosynthesis appeared faint in D.oldhami, D.vario-striata,D.beecheyana var. pubescens , D.latiflorus , A.edulis , O.labricum in the initial stage.but it appeared obvious in D.brandisii;\n the prosperous stage .the line regression all appeared obvious in D. oldhami,...