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Citation:

Effect of Close-to-Nature Management on Species Diversity in a Cunninghamia lanceolata Plantation

  • Received Date: 2014-07-22
  • The study was conducted in a Cunninghamia lanceolata stand under close-to-nature management, with three different thinning densities (75%, 55%, and 35%) and three repetitions, in the Experimental Center of Tropical Forestry, Pingxiang, Guangxi. Four broad-leaved species Castanopsis hystrix, Mytilaria laosensis, Castanopsis fissa and Machilus pingii were randomly inter-planted into the Cunninghamia lanceolata stand. The impact of close-to-nature management with different thinning densities on community composition, species diversity and growth status were studied. The results showed that after five years of the close-to-nature management, the number of species in tree layer, shrub layer and herb layer highly increased. The dominant species in shrub layer and herb layer varied before and after thinning operation, but they were mostly the same in different thinning intensities. In the shrub layer, there was no significant difference in diversity indexes between the thinning stands and the unthinned pure stands. In the herb layer, the diversity indexes in the thinning stands were higher than that of the unthinned pure stands, while the Simpson index and Pielous evenness index were significantly higher than the pure stand. The average DBH of Cunninghamia lanceolata was significantly increased with the thinning intensities, but no significant difference was found in tree height. The DBH and height of the broad-leaved trees grew as the thinning density increasing. Significant differences were found in the DBH and height of Castanopsis fissa and Castanopsis hystrix in different thinning intensities. Intolerant species such as Castanopsis fissa and Mytilaria laosensis, as well as neutral species Castanopsis hystrix were good for inter-planted in high thinning intensity during close-to-nature management in Cunninghamia lanceolata plantation, while the shade tolerant species like Machilus pingii performed better in medium thinning stands.
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Effect of Close-to-Nature Management on Species Diversity in a Cunninghamia lanceolata Plantation

  • 1. Forestry College, Guangxi University, Nanning 530004, Guangxi, China
  • 2. Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China
  • 3. Guangxi Youyiguan Forest Ecosystem Research Station, Pingxiang 532600, Guangxi, China

Abstract: The study was conducted in a Cunninghamia lanceolata stand under close-to-nature management, with three different thinning densities (75%, 55%, and 35%) and three repetitions, in the Experimental Center of Tropical Forestry, Pingxiang, Guangxi. Four broad-leaved species Castanopsis hystrix, Mytilaria laosensis, Castanopsis fissa and Machilus pingii were randomly inter-planted into the Cunninghamia lanceolata stand. The impact of close-to-nature management with different thinning densities on community composition, species diversity and growth status were studied. The results showed that after five years of the close-to-nature management, the number of species in tree layer, shrub layer and herb layer highly increased. The dominant species in shrub layer and herb layer varied before and after thinning operation, but they were mostly the same in different thinning intensities. In the shrub layer, there was no significant difference in diversity indexes between the thinning stands and the unthinned pure stands. In the herb layer, the diversity indexes in the thinning stands were higher than that of the unthinned pure stands, while the Simpson index and Pielous evenness index were significantly higher than the pure stand. The average DBH of Cunninghamia lanceolata was significantly increased with the thinning intensities, but no significant difference was found in tree height. The DBH and height of the broad-leaved trees grew as the thinning density increasing. Significant differences were found in the DBH and height of Castanopsis fissa and Castanopsis hystrix in different thinning intensities. Intolerant species such as Castanopsis fissa and Mytilaria laosensis, as well as neutral species Castanopsis hystrix were good for inter-planted in high thinning intensity during close-to-nature management in Cunninghamia lanceolata plantation, while the shade tolerant species like Machilus pingii performed better in medium thinning stands.

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