Liu Ling, Wu Long-Hua, Li Na, Cui Li-Qiang, Li Zhu, Jiang Jin-Ping, Jiang Yu-Gen, Qiu Xi-Ya, Luo Yong-Ming
Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.
Huan Jing Ke Xue. 2009 Nov;30(11):3422-6.
A field plot experiment was conducted to study the effects of planting densities on the growth and heavy metals uptake by Sedum plumbizincicola. The results showed that yields of Sedum plumbizincicola were enhanced with the increase of planting density; however, there was no further increase when planting density was too high. With planting density increasing from 1.1 x 10(5) plants per hm2 to 4.4 x 10(5) plants per hm2, Cd and Zn uptake of aboveground Sedum plumbizincicola increased from 0.208 kg x hm(-2) to 0.631 kg x hm(-2), from 13.2 kg x hm(-2) to 58.7 kg x hm(-2), respectively; yet, there was no significant enhancement between the planting density of 4.4 x 10(5) plants per hm2 and 1.0 x 10(6) plants per hmb2. When planting density was 4.4 x 10(5) plants per hm2, the Cd and Zn removal rates in contaminated soil were 21.1%, 4.60%, respectively. Appropriate planting density would benefit Cd and Zn uptake of aboveground Sedum plumbizincicola, and shorten phytoremediation period.
开展了田间小区试验，以研究种植密度对东南景天生长及重金属吸收的影响。结果表明，东南景天的产量随种植密度的增加而提高；然而，当种植密度过高时产量不再进一步增加。随着种植密度从每公顷1.1×10⁵株增加到每公顷4.4×10⁵株，地上部东南景天对镉和锌的吸收量分别从0.208千克/公顷增加到0.631千克/公顷、从13.2千克/公顷增加到58.7千克/公顷；然而，每公顷4.4×10⁵株与每公顷1.0×10⁶株的种植密度之间吸收量没有显著增加。当种植密度为每公顷4.4×10⁵株时，污染土壤中镉和锌的去除率分别为21.1%、4.60%。适宜的种植密度有利于地上部东南景天对镉和锌的吸收，并缩短植物修复周期。
