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台湾相思属含羞草科,常绿乔木,高达15米,胸径åœ?/span>40-60厘米,树干灰色有横纹,枝灰色无剌,叶退化,叶柄呈叶状,披针形,头状花序叶腋生,8月荚果成熟。原产台湾省,福建、广东、广西、海南皆有栽培。喜光,根深材韧,抗风力强。根系发达,具根瘤,能固定大气中的游离氮。萌芽力强,生长较快。对土壤要求不严,耐干旱瘠薄,病虫害少。是荒山造林的先锋树种,又是防护林、水土保持林、薪炭林、四旁绿化的主要树种,当前也用于石场复绿、山坡绿化、生态绿化等,直接用种子撒播ã€?/span>
1、育苗造林技æœ?/span>
1.1种子处理
台湾相思树的繁殖一般采用的是有性繁殖方å¼?/span>ï¼?/span>其种子表面有1层坚硬的蜡质å±?/span>ï¼?/span>因此采用种子繁殖方式在播种前一定要对种子作特殊处理。用70 ℃的温水浸泡种子ï¼?/span>待种子自然冷却后ï¼?/span>换用冷水再浸æ³?/span>24 小时(也可以播前ç”?/span>90沸水烫种不超è¿?/span>1分钟,再用冷水浸ç§?/span>30小时)沥干后置在布袋中催èŠ?/span>ï¼?/span>种子露白后即可直接用于点播。播å�?/span>7天开始发芽ã€?/span>
1.2 水肥管理
种子播种后每天早、晚各淋水一次,保持土壤湿润。如太阳光较强烈,可ç›?/span>75%的遮光网,苗木长出真叶后ï¼?/span>视苗木生长状况和苗木出售造林时间ï¼?/span>开始施肥管理,适当薄施0.3%ï½?/span>0.5%浓度复合肥水ï¼?/span>10~15天施一æ¬?/span>ï¼?/span>每次施水肥后一定要再浇过一遍清水,以防肥水灼伤苗木叶片,影响苗木生é•?/span>(幼苗期切记勿施尿素肥æ–?/span>ï¼?/span>以免烧焦叶片ï¼?/span>影响生长)。以后苗木生长逐渐加快ï¼?/span>这时要供给足够的水肥ï¼?/span>以加速苗木的健壮生长ï¼?/span>提高出苗质量。苗é«?/span>20-25厘米以后可出圃造林ã€?/span>
2.2营养杯播ç§?/span>
营养土应ç”?/span>50%黄心土ã€?/span>35%火烧土ã€?/span>10%有机肥ã€?/span>5%过磷酸钙或钙镁磷混合均匀堆沤数日å�?/span>ï¼?/span>充分粉碎过筛ï¼?/span>营养é’?/span>ï¼?/span>è£?/span>8 cm×13 cm的薄膜营养袋。每个营养杯中只能点æ’?/span>1粒已催芽露白的种子。种子点播在营养杯后ï¼?/span>淋透水ï¼?/span>ç”?/span>50%~60%的遮阴网进行搭棚遮阴ï¼?/span>温度过低æ—?/span>ï¼?/span>在遮阴网上面ç›?/span>1层薄膜进行保æ¸?/span>ï¼?/span>每天视情况洒1~2次水ï¼?/span>保持土壤湿润ã€?/span>
2.3苗期管理
台湾相思播种后7 å¤?/span>左右种子就会破土而出ï¼?/span>促进苗木发育、提高苗木质量、便于苗木适应环境的主要措施是炼苗。可于温暖晴天的14:00将遮阴网全部揭开ï¼?/span>并在日落前再盖好ï¼?/span>逐渐增加阳光照射时间ï¼?/span>ç»?/span>7 d的炼è‹?/span>ï¼?/span>遮阴网即可彻底揭掉。幼苗揭棚后ï¼?/span>要加强水肥管ç�?/span>ï¼?/span>做到及时浇水ï¼?/span>保持营养杯土壤湿æ¶?/span>ï¼?/span>5~7 dæ–?/span>1次复合肥ï¼?/span>做到勤施薄施ï¼?/span>防止造成肥害ï¼?/span>影响苗木正常生长。为提高造林成活çŽ?/span>ï¼?/span>应在苗木出圃å‰?/span>30 d进行移苗断根。移苗后应进行遮è�?/span>ï¼?/span>待苗木生长稳定后ï¼?/span>揭去遮阴ç½?/span>ï¼?/span>同时喷药防治病虫å®?/span>ï¼?/span>这样才可以保证造林的成活率。待幼苗长到15~25 cm高时即可出圃造林ã€?/span>
2.4 造林
苗木的质量直接影响造林成活率以及成材以后林相的整齐ï¼?/span>因此造林的苗木必须是合格è‹?/span>ï¼?/span>高度åœ?/span>15 cm以上ï¼?/span>地径0.3 cm以上ï¼?/span>至少要有3片假叶的苗木。虽然相思树对土壤的要求不高ï¼?/span>但其是一种速生的热带绿树种ï¼?/span>要求高温高湿的生长环å¢?/span>ï¼?/span>宜选择在海æ‹?/span>350 m以下ï¼?/span>湿润疏松的微酸性、中性壤土或砂壤土上生长最好。一般宜在造林的前一年冬季清除造林地上的灌木丛、杂è�?/span>ï¼?/span>开好树ç©?/span>ï¼?/span>穴规æ ?/span>40 cm×40 cm×40 cm。营造纯林的造林密度可大äº?/span>ï¼?/span>株行è·?/span>1.5 m×1.5 m,异性营养钵ï¼?/span>密度约为4 400æ ?/span>/公顷。提前整地备è€?/span>ï¼?/span>才能使土壤充分风åŒ?/span>,营养更丰富。相思树在栽植前10 d要施足基è‚?/span>ï¼?/span>每穴施复合肥250g或磷è‚?/span>500 g,肥料要与土壤充分搅拌均匀ï¼?/span>以防造成肥料灼伤苗木根系ï¼?/span>提高肥料的效果。相思树一般选择在雨季造林ï¼?/span>最好是3月上旬至4月中旬。因为这段时间气温逐渐回升ï¼?/span>对相思树树苗移植后的恢复生长有利。由于相思树生长迅é€?/span>ï¼?/span>一èˆ?/span>1ï½?/span>2年后即可郁蔽成林ã€?/span>
2.5抚育管理
台湾相思树的抚育管理主要在造林当年进行。应进行全铲抚育2次以ä¸?/span>ï¼?/span>必须保持林地干净ï¼?/span>不长草和杂灌木及藤木ï¼?/span>ç¬?/span>1次在5â€?/span>6月进è¡?/span>ï¼?/span>ç¬?/span>2次在8â€?/span>9月进行。结合铲除杂草和杂灌木及藤木的同时进行施è‚?/span>ï¼?/span>ç¬?/span>1次施尿素100 g/æ ?/span>,ç¬?/span>2次施复合è‚?/span>150 g/株。在抚育作业æ—?/span>ï¼?/span>要保持幼苗不歪斜ï¼?/span>以减少成林后单坎多株的现象发生。台湾相思与桉、松、樟树混交造林的效果很å¥?/span>ï¼?/span>是较理想的伴生树ç§?/span>ï¼?/span>其混交比例为1âˆ?/span>1æˆ?/span>1âˆ?/span>(2~3),可采用行间混交或行带混交的方式造林ã€?/span>(叶佐å¸?/span> 整理)