A study on the relationship between vegetation pattern and environment in the upstream of Minjiang River, China

Characteristics of annual and seasonal precipitation variation are explored in the upstream of Minjiang River (UMR), Southwestern China, spanning from 1960 to 2015. The moment of method (MOM), linear regression method, Mann–Kendall test, sequential cluster analysis, and Morlet wavelet analysis were utilized. The results clearly show the following: (1) Distribution of precipitation is uneven in space, with more in the south and less in the southeast. Decade average of annual precipitation reached the lowest in the 2000s and increased during 2010–2015 at all gauging stations and UMR. (2) Areal annual precipitation exhibited an insignificant decreasing trend with a rate of 4.47 mm/10a, which was mainly attributable to decreased summer precipitation. Spring precipitation exhibited an insignificant increasing trend and winter precipitation remained unchanged. (3) The change points mainly appeared in the 1980s and 1990s. And the almost periods of study area were generally 2–5 years, 7–11 years, and 15–20 years. (4) The increasing trend of annual precipitation is relatively obvious at higher altitudes, while the decreasing trend is more significant at low altitude stations.

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Snow Avalanches and Vegetation Pattern in Cascade Canyon, Grand Teton National Park

The UW National Parks Service Research Station Annual Reports ◽

10.13001/uwnpsrc.1986.2565 ◽

1986 ◽

Vol 10 ◽

pp. 104-119

Author(s):

Robin Patten ◽

Dennis Knight

Keyword(s):

Environmental Conditions ◽

National Park ◽

Vegetation Pattern ◽

Slope Aspect ◽

Vegetation Patterns ◽

Vegetation Types ◽

Snow Avalanches ◽

The South ◽

Grand Teton National Park ◽

The Relationship

Snow avalanches are an important factor in the landscape of Cascade Canyon, influencing both the vegetation types and their distribution. The relationship between avalanches and vegetation is most apparent in the conifer woodlands. Large-conifer woodlands are found primarily outside of avalanche areas while essentially all of the Small-conifer woodlands are within avalanche areas. This suggests that Small-conifer woodlands are created and maintained by avalanches. Slope aspect is also important in the vegetation pattern of Cascade Canyon. Environmental conditions resulting from the aspect of the slope affect vegetation distributions and potentially reduce the importance of avalanches in structuring vegetation patterns, especially on the south-facing slope.

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Discussion of “Quantifying the Impacts of Climate Change and Human Activities on Runoff Variation: Case Study of the Upstream of Minjiang River, China” by Shuqi Liang, Wensheng Wang, Dan Zhang, Yueqing Li, and Guoqing Wang

Journal of Hydrologic Engineering ◽

10.1061/(asce)he.1943-5584.0002095 ◽

2021 ◽

Vol 26 (6) ◽

Author(s):

Mahsa Jahandideh-Tehrani

Keyword(s):

Climate Change ◽

Human Activities ◽

Runoff Variation ◽

Minjiang River ◽

Upstream Of Minjiang River ◽

Impacts Of Climate Change

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Interstellar gas in the central region of the Galaxy

Symposium - International Astronomical Union ◽

10.1017/s0074180900101032 ◽

1967 ◽

Vol 31 ◽

pp. 239-251 ◽

Cited By ~ 3

Author(s):

F. J. Kerr

Keyword(s):

Central Region ◽

Galactic Plane ◽

Neutral Hydrogen ◽

Continuum Emission ◽

Galactic Centre ◽

Interstellar Gas ◽

Hydrogen Recombination ◽

The Galaxy ◽

Centre Region ◽

The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

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The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽

10.1017/s0094837300025707 ◽

1980 ◽

Vol 6 (02) ◽

pp. 146-160 ◽

Cited By ~ 29

Author(s):

William A. Oliver

Keyword(s):

Critical Points ◽

Scleractinian Corals ◽

Convincing Evidence ◽

Early Triassic ◽

Rugose Corals ◽

History Of ◽

The Subject ◽

Relationship Of ◽

The Relationship ◽

Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

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