遮阴环境对6种景天属植物生长的影响研究

目的]研究遮阴对6种景天植物生长的影响，了解景天植物的耐阴性。方法]对6种景天植物采取1／3全光照、1／6全光照遮阴处理，以全光照为对照，研究景天植物在不同光照条件下的生长情况。结果]在遮阴条件下，6种景天属植物均出现徒长现象，株高显著高于全光照；叶片变薄，叶片长度和叶片宽度增加。遮阴结束时，德景天、三七景天、红花德景天、卧茎景天和八宝景天有徒长现象，无叶片脱落现象，生长基本正常；红叶景天叶片脱落严重，生长不良。遮阴结束后红叶景天恢复生长慢，其他景天20d后基本恢复正常。结论]德景天、三七景天和红花德景天耐阴性强，卧茎景天和八宝景天耐阴性较强，红叶景天耐阴性相对最弱。

Effects of Shading on Growth Characteristics in Six Sedum Plants

Objective ] To study effects of shading on growth of six Sedum plants. Method ] Effects of shading （ 0 sun-shading, 2/3 sunshading, 5/6 sun-shading） on growth characteristics of six Sedum plants were studied. Result] The results showed that ： Under shading conditions, six plants all displayed performance of spindling, plant height higher than that of full exposure obviously, leaf becoming thin, leaf length and leaf width increasing. Five plants showed appearance of spindling but without leaf falling off in Sedum hybridum, Sedum aizoon L. , Sedum hybridum＇ Immergrunchell＇ , Sedum spectabile Boreau and Sedum sarmentosum Bunge, and their growth was regular. Sedum spurium ＇ Coccineum＇ showed appearance of failing off leaves seriously and its growth was irregular. Sedum spurium＇ Coccineum＇ was slow to renew growth but other five plants recovered growth after twenty days when shading treatments were over. Conclusion ] Sedum hybridum, Sedum aizoon L. , Sedum hybridum＇ Immergrunchell＇ have strong shading resistance, Sedum spectabile Boreau and Sedum sarmentosum Bunge tale the second place, the shading tolerance of Sedum spurium＇ Coccineum＇ is the weakest.