Download (2674Kb) - NERC Open Research Archive - Natural ...

More documents

Recommendations

Info

2.3.4 Sampling proportions 20 Eastern, Southern and Western Region random samples, which were all ascribed post-hoc to stratification classes have been tabulated with the stratified London Midland Region survey to show the percentage of units sampled within each class (Table 2.3). A minimum of 33% is found in the anomalous ((15 members after amalgamation) South Coast Class, 6. Elsewhere the figure varies between - 38%-and-82%T-with-a-mean-for-all-classes—(excluding-those-with representatives in Scottish Region) of 50%. These figures apply only to the random survey and do not include sites visited in either the cutting/embankment or Biological Interest surveys. When all information is combined, the mean sampling percentage will be in excess of 70%. 2.4 Comparison of vegetation and track classifications Quadrat information from the 60 random sites visited in Southern and Western Regions during 1978 was classified using ISA. The results, with and without weighting for percentage cover, are given in the Third Interim report (Sargent & Mountford 1979). The vegetation classification derived without cover information was compared with the geographic classification of BR land (track classification) introduced to provide sampling strata. Vegetation and track classifications were arrayed according to their scores on respective first axes of RA ordination (Table 2.4). A total of 573 quadrats clasified into 14 vegetation types were distributed throughout the 14 track classes having members in Southern and Western Regions. An initial inspection of the table (2.4) suggests that there is no clear association between track and vegetation classes. Certain kinds of vegetation occur throughout BR land irrespective of locally prevalent geographical and climatic conditions. Such vegetation is disturbed and deflected by the dominant influences and effects of BR management and usage; including periodic clearing and spraying and the dumping of ballast, cinder aridnitrogenous waste. From Southern and Westerrr Regions, for example, such vegetation falls into the following-classes: 1. Disturbed, well drained Arrhflttherun with bramble. 5. Damp, nitrophilous Arrhe!;:-.7thorz,:n with nettle and bramble. . 7. Rank cinder and ballast vegetation. Ash scrub. Base poor scrub. 12. Rank open hawthorn scrub. In Table 2.5 these classes have been removed from the array and clustering.. of the remaining classes emphasised by dotted lines. Similarities exist in the distribution of track and more stable or undisturbed vegetation classes. In particular, following the method of Bunce & Smith (1978) a linear relationship may be shown to exist between the classifications. Kendalls coefficient of rank correlation giveset:= .53*, whilst a regression analysis of mean vegetation score (y) against track classes (x) (considered as constant) produces the equation y = .65 43.57, p = .72*. A linear equation may not be the most.appropriate way of expressing the relationship between these classifications since the rank order of track and vegetation classes is by mean RA score and may not reflect a direct linearity in the environment.
V A Table 2.4 Southern and Western Regions track and vegetation classes arranged with respect fo first axis RA ordination scores. Class 1 2 3 5 7 Score 12 13 16 22 2 79 2 1 4 77 6 1 73 43 15 3 6 10 3 70 7 8 67 9 7 7 65 9 5 2 3 6 58 9 3 5 56 8 12 1 7 5 11 46 .2 10 38 17 3 5 3 13 37 9 7 1 1 14 35 1 8 12 31 20 14 4 4 3 9 27 11 16 2 25 26 151 87 15 50 52 21 TRACK 14 13 8 4 22 24 29 30 32 1 2 1 3 63 3 9 25 2 5 5 4 1 3 9 1 2 17 13 9 5 1 6 48 10 69 11 20 17 24 16 33 38 39 49 50 1 1 8 2 1 1 1 14 3 2 2 96 1 3 6 5 56 1 24 2 1 5 36 1 17 1 1 7 12 63 1 5 10 1 58 18 9 4 1 72 3 5 97 4 15. 7 25 34 573
Page 1 and 2: crirTh Tritc,r ture .-on:Rervancy C
Page 3 and 4: I. INSTITUTEOF TERRESTRIAL ECOLOGY
Page 5 and 6: SUKMARY The background of the work
Page 7 and 8: CONTENTS SUISLARY 1_ INTRODUCTION 1
Page 9 and 10: 1 INTRODUCTION 1 April 1979 to Marc
Page 11: 2.2.1 Attributes The selection of a
Page 14 and 15: .IMOOil 101111119111111011411111111
Page 16 and 17: Table 2.2. Preferential Attributes.
Page 18 and 19: 10 All four qouthern British Rail R
Page 20 and 21: 1 1 12 Class 9 Central Eastern Lowl
Page 22 and 23: Class 14 Lancashire Plain 14 Estima
Page 24 and 25: Class 19 Scottish lowlands 16 Estim
Page 26 and 27: 1 1 1 1 1 1 18 Acid brown and organ
Page 30 and 31: V 22 Table 2.5. The assemblarestof
Page 32 and 33: 3 THE LONDON MIDLAND REGION 24 This
Page 34 and 35: . . FIcructE l . ciary . F3c4iusq r
Page 36 and 37: 28 Hornungiapetraea,Pyrolar. rotund
Page 38 and 39: -- Aóphila-arenar;ia- 30 Table 3.2
Page 40 and 41: Table 3.2 (continued) Larixdeciduam
Page 42 and 43: Table 3.2 (continued) 34 Valerianel
Page 44 and 45: Table 3.3 . Bryophytes recorded fro
Page 46 and 47: (b) Hepatics Farbilophoziafjoerkei
Page 48 and 49: ON BR T ALS ANIMAL RECORD REGN. DIV
Page 50 and 51: Erithacusrubecula robin Turdusmerul
Page 52 and 53: 44 Table 3.6 . Species list of inse
Page 54 and 55: Table 3.7 . Species list of other i
Page 56 and 57: Table 3.8 Soil invertebrates. 48 Cl
Page 58 and 59: 50 To try, on the other hand, to so
Page 60 and 61: 6 REFERENCES 52 BUNCE, R.G.H. & SMI
Page 62 and 63: NOTES WIDTII 11 FORM SITE NAME RAIL
Page 64 and 65: NOTES WIDTH 11 RAILWAY LINE. SIDE F
Page 66 and 67: WIDTH CRID OF SITE NAYS RAILWAY LIN
Page 68 and 69: NOTES WIDTH II FORM SIDE RAILWAY LI
Page 70 and 71: WIDTH NOTES RAILWAY LINESIDE FORM S
Page 72 and 73: IrlDnt Bons GRID OF RAILWAY LINESID
Page 74 and 75: WIDTH NOTTS SITE NAME RAILWAY LINE
Page 76 and 77: WIDTH rom NCTTES BITE NAVE RAILWAY
Page 78 and 79:
W1 12711 GRID OF SITENUM NOTTS RAIL
Page 80 and 81:
WIDTli GRID OF NOTES RAILWAY LIMESI
Page 82 and 83:
WI 1 NOTES SITE NAIM RAILWAY LINE 8
Page 84 and 85:
nano oissoosonnsonomeln
Page 86 and 87:
REF DATE SITE MAW RAILWAY LINZ SIDE
Page 88 and 89:
CRID OF RAILWAY LINE SIDE FORMSOURC
Page 90 and 91:
NOTTS SITE Loa RAILWAY LINE SIDE FO
Page 92 and 93:
: SIDE FORM RAILWAY LINE 817! NAME
Page 94 and 95:
- EL: ----- . . . . . Miles \0 ci y
Page 96 and 97:
6 119 .63 63 69 6 61 63 63 70 63 67
show all

Download (2674Kb) - NERC Open Research Archive - Natural ...

Create successful ePaper yourself

Delete template?

Save as template?