The spatial distribution and population dynamics of Quercus liaotungensis Koidz., Fraxinus rhynchophylla Hance and Acer mono Maxim. were studied in three warm temperate deciduous forests in Dongling Mountain, Beijing....The spatial distribution and population dynamics of Quercus liaotungensis Koidz., Fraxinus rhynchophylla Hance and Acer mono Maxim. were studied in three warm temperate deciduous forests in Dongling Mountain, Beijing. Clumped distributions appeared in most seedlings (≤0.4 m), short saplings (0.4-1 m) and tall saplings (1-2 m). Random distributions appeared in adults of Q. liaotungensis in Plot 1, F. rhynchophylla in Plot 3. The LSD method was used to discern the differences of different aged population. The class distribution of Q. liaotungensis was nearly a reverse-J shape for Plot 1 and Plot 3, suggesting that the population regenerates continuously. The age-structures of F. rhynchophylla and A. mono in Plot 1 and the test results indicated that they would increase continuously. In Plot 2, the class distribution and the test results showed that all populations would not regenerate continuously.展开更多
Let G be a locally compact Abelian group with Haar measure.The authors discuss some basic properties of L_(w_1)~r(G) ∩ L(p,q,w_2dμ)(G) spaces.Then the necessary conditions for compact embeddings of the spaces L_(w_1...Let G be a locally compact Abelian group with Haar measure.The authors discuss some basic properties of L_(w_1)~r(G) ∩ L(p,q,w_2dμ)(G) spaces.Then the necessary conditions for compact embeddings of the spaces L_(w_1)~r(R^d)∩L(p,q,w_2dμ)(R^d) are showed.展开更多
文摘The spatial distribution and population dynamics of Quercus liaotungensis Koidz., Fraxinus rhynchophylla Hance and Acer mono Maxim. were studied in three warm temperate deciduous forests in Dongling Mountain, Beijing. Clumped distributions appeared in most seedlings (≤0.4 m), short saplings (0.4-1 m) and tall saplings (1-2 m). Random distributions appeared in adults of Q. liaotungensis in Plot 1, F. rhynchophylla in Plot 3. The LSD method was used to discern the differences of different aged population. The class distribution of Q. liaotungensis was nearly a reverse-J shape for Plot 1 and Plot 3, suggesting that the population regenerates continuously. The age-structures of F. rhynchophylla and A. mono in Plot 1 and the test results indicated that they would increase continuously. In Plot 2, the class distribution and the test results showed that all populations would not regenerate continuously.
文摘Let G be a locally compact Abelian group with Haar measure.The authors discuss some basic properties of L_(w_1)~r(G) ∩ L(p,q,w_2dμ)(G) spaces.Then the necessary conditions for compact embeddings of the spaces L_(w_1)~r(R^d)∩L(p,q,w_2dμ)(R^d) are showed.
